i65 



female, measured from the orbital to the posterior margin, proves to be 31,5 mm. long, the 

 rostrum, measured in a straight line from the orbital margin to the apex, 32 mm., the abdomen 

 73,5 mm., entire length 137 mm.; in the male the carapace is also 31,5 mm. long, the abdomen 

 74 mm., but the rostrum is broken off just before the antennular peduncle. The carapace appears 

 in a lateral view 22,5 mm. high, being nearly one and a half as long as high. The rostrum 

 of the female, just as long as the carapace, is strongly recurved and continued as a high 

 compressed carina on the gastric region, gradually fading away near the posterior margin. The 

 gastric carina is armed with 5 equidistant teeth, of which the i^', the smallest of all, stands 

 a little behind the middle of the carapace and the 5"' above the orbital margin; the 

 rostrum proper bears 3 teeth, the i"^' above the eyes as far from the 5''^ gastric tooth as this 

 tooth from the 4"% the 2°'^ opposite the far end of 2"<i antennular article, as far from the i *' 

 as the I*' from the tooth above the orbital margin, the 3"^ a little beyond the middle, twice 

 as far from the 2°'' as the 2"*^ from the 1^'; the 3"' and the 4"' tooth of the gastric carina 

 are the largest, the following gradually diminish in size. Ventrally the rostrum is armed with 

 10 rather small teeth, of which the i^' is placed between the i*' and the 2°'^ of the upper 

 margin, just beyond the eyes; these teeth also gradually become smaller and the 6 anterior 

 stand before the y^ tooth of the upper margin. In the male the ^^'^ tooth of the gastric carina 

 stands just behind the orbital margin, the i*' tooth of the rostrum proper is placed above the 

 eye, the 2"'' above the far end of i^' antennular article, the 3'''*, close to which the rostrum 

 is broken, one and a half as far from the 2"^^ as the 2"'^ from the i^'. 



As regards the carination of the carapace and the form and size of the two spines on 

 the anterior margin, Heteroc. lepidus does not differ from Heteroc. tricarinatus. The superior or 

 postocular carina begins just behind the insertion of the eyestalk, one millimeter distant from 

 the orbital margin, runs at first backward and a little downward, but curves just in front of 

 the middle obliquely upward and fades away near the posterior margin of the carapace; the 

 orbital spine is small, not yet reaching as far forward as the basal process of the stylocerite, 

 nor reaching to the posterior margin of the cornea of the eyestalk and is continued into a 

 mere buttress instead of a well-developed carina. The branchiostegal spine has the same size 

 as the preceding, but reaches not so far forward, namely only to the middle of the 2°'' joint 

 of the antennal peduncle ; the inferior or postantennal carina is well-developed, but, like in 

 Heteroc. tricarinahis, fades away on the anterior part of the branchial region. This description 

 is taken from the female, in the male the postantennal carina is a little less prominent. 



The abdomen also fully resembles that of Heteroc. tricarinatus Alcock & Anderson. Like 

 in this species, in Heteroc. gibbosus Bate and in Heteroc. laevigatus Bate, the 3'<i abdominal 

 tergum appears "bluntly carinated", owing to a depression on each side of the middle, that 

 fades away near the anterior and the posterior margin of the somite; this "blunt carina" appears 

 indeed somewhat convex both transversely and longitudinally and is as broad as in Heteroc. 

 tricarinatus, somewhat broader than in the two other species, the width in the middle being 

 about one-fourth of the length. Sixth somite in the male iV,-times, in the female a little more 

 than 17,-times as long as the fifth. Telson in the male slightly shorter, in the female a little 

 lono-er than the 5"' and the 6"' somite taken together; in the male it is as long as the uropods, 



