74 Cakl Bovallius, The Oxycephalids. 



inferior angle acute, projecting. The sixth segment long and narrow, 

 slightly longer than the peduncle of the first pair of caudal appendages. 

 — — — Telson narrow, acute at apex.» 



Colour. Pellucid. 

 Length. »12 mm.» (Streets). 



Hab. The Pacific, Lat. 28» 6' N, Long. 140' 12' W. One specimen a 



female ( Streets). 



2. Calainorliyiichus rig:i(lus, Th. Stebbing, 1888. 



Diagn. The head is much longer than the whole perœon, as long as 

 the perœon and the first two pleonal segments together; the 

 rostrum is fully as long as the ocular region of the head. 



The lower hind corner of the carpus of the second pair of 

 perœopoda is less produced than in the preceding species. 

 The femur of the last three pairs is more or less pear- 

 shaped; the seventh pair are nearly as long as the whole 

 sixth. 



The first pair of uropoda reach far beyond the apex of the 

 second, and to the apex of the last pSir, which are much 

 shorter than the telson. 



Spi. 1888. Calamorhynchus rigidus, Th. Stebbing. 39, p. 1600, pi. 206 



Apart from the characteristics recorded in the diagnosis respecting 

 the seventh pair of pei-eeopoda and the relation of the uropoda, the 

 difi'erences between the two species seem to be very small, or at least 

 are not easily appreciated owing to the vague description given by Streets 

 of his species, and to the want of drawings. The characteristics recorded 

 above are however sufficient for the distinction of the two species. 



For particulars on Calamorhynchus rigidus I refer the reader 

 to the original description and drawings given by Stebbing. 



Coi-OUR. ? 



Length. 23 mm. (niue-tenths of an inch, Stebbing). 



Hab. The South Atlantic. Lat. 37» 45' S, Long. 33» 0' W. »One 



specimen, female, with young in the pouch» (Stebbing). 



