FAMILY SPHAROMIDA. : 89 
this stylus is in reality (compare my paper on the “ Asellota,” 
1905) the second joint of that endopod. On endp. of plp.' 
no trace of an auxiliary stylus is found; in Campecopea 
hirsuta (Mont.) I found a short process, not marked off by 
articulation, proceeding from endp. of plp.* near its end, 
while the appendix on plp.? is exceedingly long, and 
originates at the base of endp. Of three European species 
of Dynamene (Nesa) (Leach) I have inspected in all several 
adult males, but in none of them an appendix masculina was 
found, and the inner margin of the endopod of plp. is 
simple, not thickened. In adult males of Ancinella pro- 
funda (n. gen., n. sp.) no appendix masculina is found, 
but the inner margin of endp. of plp.* is considerably 
thickened, with a longitudinal groove on the inner side of 
this thickening; in the female this margin is of normal 
inconsiderable thickness without any groove. 
At least in the sub-family Spheromine, the appendix 
masculina does not appear before the animals are nearly full- 
grown, but it is easy by another character to distinguish 
males even when not half-grown from immature females. As 
is known, the males have two processes close together on the 
seventh thoracic sternite; these processes, which are tubes 
containing the terminal portion of the ducts from the genital 
organs, are sometimes rather short (Tecticeps), sometimes 
rather long (Dynamene), very long (Cymodoce pilosa), 
or even exceedingly long (Dynamenella bermudensis) ; 
they are found in all genera. Of Cymodoce pilosa (M.- 
Edw.) I collected at Siracusa a rich material consisting of both 
sexes in very different size and age; an unusually small adult 
male measures 10°7 mm., the largest male 15 mm. in length, 
but in numerous immature males measuring from 9°7 to 13°7 
mm. no vestige of the appendices on endp. of plp.’ can be 
found, while the processes at seventh thoracic sternite are 
shorter than in the adults, but yet very distinct. The marsupial 
lamellae are mentioned above. The length of flagellum of 
antennule and antenne in the two sexes has not been specially 
examined, but at least sometimes differences are well marked. 
