118 H. J. HANSEN. 
long as the second, rather slender and strongly compressed ; 
all four pairs along the margins and on a portion of the sides 
very densely set with fine hairs; most of the marginal hairs 
long or exceedingly long. Last abdominal segment is broad 
behind, the posterior margin as a whole rather flatly convex 
with a very obtuse angle, but the tip of this angle is feebly 
produced, acute; the posterior margin is very broad on the 
lower surface, constituting a rather broad rim, which has a 
longitudinal mesial carina. ‘lhe rami of the uropods similar in 
shape, reaching in the male completely, in the female scarcely, 
to the apex of abdomen. Length of the male 13°5 mm., 
of the female without marsupium 8°5 mm. Locality: Soura- 
baya, Java. Collected by Captain Andréa (Copenhagen 
Museum). 
(3) Exosphzeroma (Stebb.).—The genus has been estab- 
lished on Spheroma gigas (Leach) and S. lanceolatum 
(White). In these species the end of abdomen is either 
rather convex, subangular, or constitutes an angle with the 
tip rounded ; the terminal margin is, seen from below, rather 
sharp and the excavation containing the pleopods produced a 
little backwards, but no real longitudinal groove is formed. 
According to an examination of dried typical specimens of 
Spher. leucura (White) in the British Museum this species 
must be referred to HExospheroma; Spheroma Stimp- 
sonii(Hell.) (specimens in the Copenhagen Museum) belongs 
also to the present genus. Several of the nearly twenty 
species enumerated above as referred to Spheroma by 
earlier authors, but whose systematic position 1 am unable to 
settle, will certainly prove themselves to belong to Exosphe- 
roma. On the other hand, of the three species established in 
1902 by Stebbing as species of Hxospheroma, H.validum 
(Stebb.) is the immature male and HE. setulosum (Stebb.) 
the female of the same species of Cymodoce, while H. 
amplifrons (Stebb.) is the adult male of an aberrant 
species of Cymodoce (see below under this genus). 
(4) Isocladus (Miers).—The genus comprises two closely 
allied species, I. armatus (M.-Edw.) and I. spiniger 
