Porpitella Haeckel 1888

Haeckel 1888. Report on the Siphonophorae collected by H. M. S. Challeuger during the years 1873-76. Scientific Results of the Voyage of H. M. S. Challenger during the years 1873-76, vol. xxvii, pt. lxxvii. 1888: iii & 380 pp.