A revision of Ernst HaeckeFs determinations of a collection of Medusae | 57 



Thaumantias (Cosmetira) pilose/la Forbes, which is a Mitrocomid). I have previously 

 discussed the specific name (Kramp, 1919, p. 21) and adopted the name umlulata 

 Forbes & Goodsir, which was proposed by Browne (1907). 



Orchistoma steenstrupii Haeckel. 

 1879, p. 139, PI. XV, figs. 3-5. 

 [Orchistoma pileus (Lesson).] 

 (154) 20°N. 81° W., south of Cuba; Hygom. 3 specimens. 

 Two of the specimens are in good condition, and they agree quite well with the new 

 description and figures by Mayer (1910, p. 211, PI. 25, figs. 1-4), which were based 

 on specimens from near the Bahamas and Tortugas. I agree with Mayer that O. 

 steenstrupii is identical with Mesonema pileus Lesson (1843) and should be called 

 Orchistoma pileus. 



Ptychogena pinuulata Haeckel. 

 1879, p. 148; 1881, p. 7, PI. II, figs. 1-8. 

 [Ptychogena lactea A. Agassiz.] 

 (139 and 141) 59° 07' N. 13° 32' W., between Ireland and Iceland; Moberg, 

 1857. 3 specimens, one of which is designated as the type. 

 As previously mentioned by me (Kramp, 1942, p. 55) this locality is most probably 

 due to a mistake. This species is arctic, circum-polar, and it is hardly possible that 

 it should occur so far to the south in the Atlantic. Haeckel's figures (1881) are 

 remarkably beautiful and entirely correct. 



Irene viridula. 

 1879, p. 202. 

 (60) Isafjord, north-western Iceland; Mariboe, 1865. 1 specimen. 

 In the list this specimen is identified as Eirene {viridula']). It really belongs to 

 Eutonina indicans (Romanes), (see Kramp, 1919, p. 99). 



Mesonema pensile. 

 1879, p. 226. 

 (156) Karimata Strait, west of Borneo; Caspersen, 1869. 1 specimen, diameter 

 ca. 50 mm, about 125 radial canals and about 21 tentacles. Labelled 



Mesonema sp. 

 (152) 14° S. 34° W.,off San Salvador, east coast of Brazil; Hygom. 3 specimens, 



with the following dimensions : 



diam. ca. 65 mm, ca. 120 radial canals, ca. 20 tentacles. 

 „ ca. 60 mm, ca. 80 „ „ ca. 16 „ 

 ,, ca. 55 mm, ca. 90 ,, ,, '? 



The specimens No. 152 are determined in the list as Mesonema pensilel None of 

 the localities are mentioned in the monograph. 



In all the specimens the tentacle bulbs are provided with a distinct apical keel and 

 spur; they undoubtedly belong to Aequorea macrodactyla (Brandt). 



