FAMILY SPH ROMIDZ. 127 
Cilicea cordata (Richardson) and Cil. caudata Gilliana 
(Rich.) are certainly males of species of Paracerceis; on 
some forms established by H. Richardson as species of Dyna- 
mene [I refer to the notes on this genus. 
(8) Cerceis (M.-Edw.).—C. tridentata (M.-Edw.) is the 
type; according to my study of a rich material of this genus 
the species named is a male, while C. bidentata (M.-Edw.) 
is the female, either of the same or of a closely allied species. 
To this genus belong besides C. trispinosa (Hasw.) (I have 
examined specimens from Dr. Chilton) and C. acuticauda 
(Hasw.), but the reference of C. nasuta (Whitelegge) is 
doubtful, the basal jot of the antennule, the abdominal 
notch, and the pleopoda being imperfectly known. Sphe- 
roma orientale (Dana) is a young specimen of Cerceis. 
This genus is closely allied to Paracerceisand Haswellia; 
at least at present I am not able to point out reliable difference 
in the structure between the females of Paracerceis and 
Cerceis, but, as already mentioned, Paracerceis has the 
brood in internal pouches, Cerceis in the marsupium itself ; 
the females of Haswellia are unknown. It may be men- 
tioned that the outer margin of exp. of plp.? is coarsely 
serrate in Paracerceis caudata (Say) and at least in some 
species of Cerceis, but in C. trispinosa (Hasw.)—which 
besides in the shape of the abdominal notch occupies a rather 
isolated position—serration is visible only at the end of the 
margin and even feebly developed. 
(9) Haswellia (Miers) (Calyptura (Hasw.) ).—The type 
is H. carnea (Hasw.), of which only the male is known. 
According to the examination of a male (forwarded me by 
Dr. Chilton) of Zuzara emarginata (Hasw.), this species 
must be transferred to Haswellia; in H. carnea the long 
plate from seventh thoracic segment is broad in the whole 
length, while in H. emarginata only the proximal 
third of the process is plate-shaped, the long distal part 
narrow. Of H. carnea I have examined two adult and two 
immature males (all from Dr. Chilton); the adult males 
measure respectively 10°4 and 8°5 mm., the immature speci- 
