and Species of Macrurous Crustaceans, Gl 



but dense pubescence. The carapace is subovoid, armed on 

 each side, just externally to the base of the rostrum, and behind 

 the anterior margin, with an acute, forwardly directed spine ; 

 a similar spine springs from each side of the anterior margin 

 itself at about the level of the upper surface of the antennal 

 peduncle ; the basis of each of these two spines is confluent, 

 with a conspicuous convexity to be seen just behind it ; imme- 

 diately in front of each of these convexities lies a smooth, 

 slightly excavated surface, bounded in front by a curvilinear 

 row of tubercles. The cervical suture, dividing the carapace 

 into an anterior or cephalostegal, and into a posterior or omo- 

 stegal portion, is broad and deeply impressed mesially and 

 laterally, until it reaches the level of the anterior margin of 

 the epistoma, where it bends boldly upwards and backwards 

 upon itself, passing into the well-defined semicircular depres- 

 sion that bounds the lateral convexities described above. The 

 cardiac region is broader than long, very convex transversely, 

 and bounded on each side by a densely tuberculated elevation, 

 which running backwards, downwards, and forwards along the 

 line of the granulated rim of the branchiostegite, and finally 

 bending upwards almost opposite the origin of the second pair 

 of abdominal appendages, passes again into the swollen ante- 

 rior boundary of the omostegite ; the ovoidal area thus limited 

 off is more sparsely beset with tubercles, and presents a marked 

 depression on its anterior half. 



The rostrum carries on each side a most acute spine, directed 

 upwards and forwards and curved slightly inwards, and 

 above presents two roughly granulated ridges, coalescent 

 towards the tip, but divergent at the base ; beyond the spines 

 it is canaliculate on each side, above and below; and each 

 lateral ridge is fringed with long hairs ; below it is carinated 

 and coarsely granulated at the base. A faint linear impression, 

 continuous with the groove between the ridges on the rostrum, 

 passes along the middle line of the carapace almost to its 

 posterior border ; situated in this line, and marking the ante- 

 rior limit of the convex gastric region, lies an almost erect 

 spiniform tubercle. 



Antenna} and antennules. — The peduncles of these appen- 

 dages lie, as in Nephrops norvegicus^in the same horizontal line ; 

 and their inner margins are ciliate. The basal joint, or coxo- 

 cerite, of the former is extremely short, and wants the apical 

 spine in Nephrops, but the perforated conical process on its 

 inferior surface is remarkably salient ; the second is devoid 

 both of the prominent spine into which, in Nephrops, its distal 

 and external angle is produced, and of the squamiform ap- 

 pendage or scale seen in all the other recognized genera of 



