NO. 1350. NATURAL HISTORY OF THE ISOPODA— RICHARDSON. 33 



FLABELLIFERA or CYMOTHOIDEA. 

 Family MinTfM. 



ROCINELA ANGUSTATA, new species. 



Rocincla Inticauda Rich.\rdson (not Hansen), I'roc. Am. IMiilos. Soc, XXXYII, 

 1898, No. 157, pp. 14-15, figs. 5-6; Proc. U. S. Nat. Museum, XXI, 1899, 

 p. 828. 



Local if y. — Manazura, Japan. (Collected b}- the U, S. Fish Com- 

 mission steamer A/hafro-ss.) 



This species formerly identified by the author with Ji. laticatida 

 Hansen ''' from Acapulco, Mexico, is now given a new specific name. 

 It can l)e differentiated from H. Idti.cauda Hansen by the difference in 

 the width of the abdomen compared with the thorax, the abdomen 

 being much broader in JR. laticamla Hansen than in 7?. (nujiistata 

 Richardson; in having but four spines on the propodus of the prehen- 

 sile legs, while in H. hdlcauda Hansen there are six; in having six 

 spines (five are wrongly given in the earlier description) on the merus 

 of the prehensile legs, while in R. latlcauda Hansen there are four, 

 and in the shorter antennaj. Four specimens of this species were 

 obtained by the U. S. Fish Commission steamer A/hatro.ss, one from 

 ofl' San Luis Obispo Bay, California, another off Esteros Bay, (yali- 

 fornia, a third at Puget Sound, and a fourth from Unimak Island, 

 Alaska. All four specimens are alike in character; two are males, 

 and two females. The specimen from Ja})an, a male, agrees with the 

 specimens referred to R. tnif/xsfata Richardson with this exception: 

 There are four spines instead of six on the merus of the prehensile 

 legs. It has the narrow abdomen, the shorter antennse, and the four 

 spines on the propodus of the prehensile legs, as stated in the descrip- 

 tion of i?. {laticauda) axgustata Richardson. 



ROCINELA AFFINIS, new species. 



Bod}^ ovate; color uniformly yellow. 



Head large, triangidar, and produced over the basal joints of the 

 antennae in a truncate process. Eyes large, occupying the greater 

 portion of the head and contiguous along the median line. The ocular 

 lobes do not project posteriorly. The ocelli are arranged in ten rows 

 along the long axis of the eye. The first pair of antenna^ extend to 

 the end of the peduncle of the second pair of anteniue: the first joint 

 of the peduncle is very short and is almost concealed by the frontal 

 process; the flagellum consists of five joints. The second pair of 

 antennte extend but a short distance beyond the first thoracic segment; 



"Bull. :\Iu8. Comp. Zool., Ilarvanl Colloirt', 1897, XXXI, No. 5, p. lOS, pi. in, 

 tigs. 2, •?,. 



Broc. N. M. vol. xxvii— 03 3 



