The Sympoda. 165 



GEN. SCHIZOTEEMA, Caiman. 



1911. Schizotrema, Caiman, Trans. Zool. Soc. London, vol. xviii., 

 pt. 4, pp. 341, 360. 



The leading character of the genus, to which it owes its name, is 

 the circumstance that the exhalent respiratory orifices are paired and 

 widely separated from each other. As, however, this feature is not 

 confined to the present family, it is convenient to amplify the generic 

 definition by some additional characters. As only females were 

 known when the genus was first established, the absence of pleopods 

 iu the male had to be presumed, as well as the presence of exopods 

 on the first four pairs of peraeopods in that sex. The new species, as 

 represented by a male specimen, confirms both of those anticipations. 

 In the female the exopods are confined to the first two pairs of peraeo- 

 pods, but both sexes have exopods on the third maxillipeds. There 

 is no distinct telson, and the inner rarnus of the uropods is one-jointed. 



In all the three forms already described the peduncle of the 

 uropods is shorter than the inner ramus, so that the new species 

 will be found to be conspicuously distinguished from them by having 

 the rami of the uropods very much shorter than the peduncle. 



SCHIZOTREMA CALMANI, n. sp. 

 Plate LXI. 



In lateral view the pseudorostral lobes are seen to be upturned, in 

 dorsal aspect they are wide apart and slightly divergent. Following. 

 what appears to be a small upturned eyeless eyelobe the median line 

 of the carapace is finely denticulate and setulose throughout almost 

 its whole length ; the lateral margins are fringed with denticles for 

 some distance, the teeth at first rather conspicuous but presently 

 dwindling to disappearance. Owing to the smallness of the specimen 

 and the texture of the integument, details of the carapace were not 

 satisfactorily made out before dissection, and owing to its brittleness 

 the result of dissection was in this respect equally disappointing. Of 

 the pedigerous segments the last four have laterally flattened edges 

 cut into teeth, all but the last being rather widely expanded. The 

 pleon segments show lines of denticulation which are conspicuous 

 both dorsally and ventrally on all but the telsonic segment, and also 

 lateral ridges ; the fifth segment is long and distally narrowed, the 

 telsonic segment short. 



In the first antenna the first joint is much the largest, somewhat 

 geniculate, and having a small distal tooth ; the second joint is 

 similarly furnished, and is longer than the third ; the slender 



