86 



1. Paeapeneopsis stylifeka (Edw.) Plate VII., fig. 21. 



Penseus styliferuf, Milne Edwards, Hist. Nat. Crast., II., p. 418. 



PMiers, P Z.S. 1878, p. 304. Penieopsis styliferus, Sppiice Bate., Amu. Mag. Xat. Hist. (5) YIII., 1881, p. 183. 



Parapensopsis styliferus, Nobili, Boll. Mus. Torino, XVII, 1903, No. 452, p. 4, fig. 4. 



Integument firm and strong : carapace finely pimctate. 



Rostrum with a strong double curve ; its proximal curve bearing a crest 

 of 7 to 9 teeth (not including the isolated epigastric tooth), its distal curve styli- 

 form : though longer in the female, it in both sexes projects beyond the tip of 

 the antennular peduncle. The postrostral carina extends nearly to the post- 

 erior border of the carapace : it may be facetted here and there, but is not canali- 

 culate. A post-ocular tooth. A strong post-antennular (antennal) spine, the 

 buttress of which is produced backwards to the hepatic fossa : post-antennular 

 sulcus shallow. Antero-inferior angles of the carapace broadly spiniform, the 

 crest of the spine being continued backwards as a sinuous ridge (defining the 

 anterior part of the cervical groove) to a point someway behind the smallish 

 hepatic spine. Dorsal of the hepatic spine the cervical groove is hardly distin- 

 guishable. 



The carapace is cut, on either side, by a fine longitudinal suture which runs 

 from the orbit to the after limit of the gastric region ; a similar short transverse 

 suture extends across the branchiostegite at the level of the 3rd pair of legs. 



The 4!th-6th abdominal terga are sharply cariuated in the middle line : it 

 requires some imagination to see a blunt median carina on the 2nd and 3rd 

 terga also. The 5th abdominal somite is about two-thirds the length of the 

 6th, the 6th is more than two-thirds the length of the telson. The telson is 

 nearly as long as the inner caudal swimmeret, is longitudinally grooved in al- 

 most all its dorsal extent, ends very acutely, and is armed on either side with 

 very distinct fixed marginal spinelets. 



Antennular flagella about as long as the carapace without the rostrum, the 

 outer shghtly the longer. 



The external maxiUipeds, which are coarse, fall a good deal short of the 

 middle of the antennal scale. Their dactylus is slender and articulates end-on 

 with the propodite. 



A basal spine is present on the first two pairs of chelipeds only. The 5th 

 pair of legs reach into the distal third of the antennal scale. All the thoracic 

 legs have petaloid exopodites. 



Andricum symmetrical, simple : it consists of two lobes finely interlocking 

 all along their anterior edge, and simply apposed along their posterior edge : its 

 distal angles are produced into a pair of longish horn-like filaments. 



The thelycum consists of three squarish-cut lobes, a large, concave, median 



