142 SICYONIA RECTIROSTRIS. 



by the rostrum. Rostrum horizontal, measuring one 

 third the rest of the carapace, hardly reaching beyond the 

 1st joint of antennular peduncle. In 'a lateral view the 

 rostrum appears to narrow considerably, being hardly 

 half as broad at the level of the 4**1 rostral tooth, i. e. 

 near the tip, as at the base. Upper margin armed with 5 

 teeth; one tooth at the far end of the straight and hori- 

 zontal, lower margin. First tooth above the anterior mar- 

 gin of the carapace, distances between the following slightly 

 decreasing, 4^^ and b^^ tooth and the tip that is curved 

 downward, situated near one another, so that the rostrum 

 appears tridentate at the far end, like in Sic. hispinosa. 

 Lateral carina running close to the lower margin. Two 

 low teeth on the dorsal carina of the carapace, tip of 

 the anterior tooth just as far distant from the anterior 

 margin of the carapace as from the tip of the posterior 

 tooth, the latter a short way behind the middle ; the tip of 

 the anterior tooth is just as far distant from the 1»* rostral 

 tooth as the latter from the i^^. For the rest resembling 

 Sic. parvula. 



Length of the only female that was collected, 21mm. ; 

 length of carapace, rostrum included, 7,1"!™- and 5,25™™- 

 without it. 



17. Sicyonia trispinosa, n. sp. 



Station 37. Sailus ketjil, Paternoster-islands. Depth 



27 M. and less. 

 Station 51. Madura-bay and other localities iu the 

 southern part of Molo-strait. Depth from 69 to 91 M. 



Closely resembling Sic. sculpta H. M.-Edw., but distin- 

 guished by its much smaller size. Dorsal carina of 

 the carapace with three teeth, that are rather low and 

 equidistant. Rostrum as in Sic. sculpta, slightly ascending, 

 reaching to the end of 2"i<i joint of antennular peduncle; 

 just behind the tooth of the lower margin the rostrum is 

 little more than • half as broad as at the base ; upper 



Notes from the Leyden ]Museum, "Vol. XXIX, 



