124 H. J. HANSEN. 
the end of the first jot; this protuberance is wanting in 
even very large species of Cymodoce examined for com- 
parison. ‘The shape and number of the entrances to pouches 
with brood are mentioned on p. 76. 
(10) Cassidinella (Whitelegge).—This genus has been 
established on a single male specimen. In the diagnosis 
the author writes: “ Pleopoda foliate ; all except the last pair 
densely ciliate.” If that be correct, the genus must belong to 
the platybranchiate Spheromine, and besides disagree with 
these as to plp.*; according to the sentence quoted plp.‘and plp.® 
would even agree with those in Limnoria and differ from all 
Spheromine. But his eight figures of the typical species, 
C. insisa (Whitel.), show an animal which is rather alike to 
two unnamed forms seen by me and belonging to Cymodoce 
(sens. lat.); in reality, antennule, mandibles, maxillipeds, 
thoracic legs, and end of abdomen do not show any difference ; 
exp. of urp. is several times smaller than endp., but in one of 
the species alluded to the exp. is still smaller; the upper 
surface of abdomen has no processes, but this character is 
of slight value, and processes are, besides, not found in males 
of all species of Cymodoce. Judging from these facts, I 
insert Cassidinella, at least provisionally, on this place. 
B. Spheromine eubranchiate. 
(1) Dynamene (Leach) (Nesa (Leach’) ).—The type is 
D. bidentata (Mont.). Leach established the genus Nesa 
on the adult male of this species, while D. viridis (Leach), 
D. Montagui (Leach), and D. ruber (Mont.) are the female 
and immature specimens of the same species; above it is 
mentioned that Spheroma gibbosum (M.—Edw.) and 
Spher. micracanthum (Tristan) are young males of 
Dynamene, probably even of D. bidentata. Hesse estab- 
lished (1873) nine new species of Neesa from the western coast 
of France, but they are probably all unrecognisable and are 
1 As to the synonymical question on the use of either Dynamene or 
Nesa for the present genus, I refer to the footnote on p. 77. 
