STALK-EYED CRUSTACEA 103 



and the epistome well developed ; the lateral epibranchial 

 spine absent or but slightly developed. Pterygostomian 

 regions are sometimes slightly excavated and carinated. 

 First pair of legs considerably elongated ; palm and fourth 

 joint usually armed with strong spines. 



I. Lambrus (Lambrus) pourtalesii. 



Lajtibriis poiirtalesii Stimpson, A. Milne 



Edwards. 



The carapace is much wider than long, with a median 

 row of four spiniform tubercles, of which one is placed on 

 the gastric and three on the cardiac regions. In front 

 of the gastric tubercle there are two smaller tubercles, 

 arranged in a transverse line. The oblique ridge on 

 the branchial region is surmounted with three unequal 

 tubercles ; one strong tooth, spiniform, and provided with 

 a small tooth at its base, exists on the edge of the 

 carapace. There are some small scattered tubercles, 

 principally in the branchio-cardiac grooves. The grooves 

 separating the regions are of moderate depth. The 

 general surface is punctuate and granular, having an 

 eroded appearance. The largest tooth is on the hepatic 

 region. The antero- lateral edge, behind the cervical 

 groove, has nine small teeth. The rostrum is of moderate 

 dimensions ; it is advanced obliquely downwards and 

 forwards, and has a tooth on each side near its base, and 

 one smaller tooth near its extremity. On a level with 

 the second tooth the rostrum contracts suddenly about 

 one-half its breadth. 



The first pair of legs is very long, their edges being 

 armed with teeth. The arms are convex, with granules 

 and tubercles on their superior surface ; the large tubercles 

 on their centre are spiniform. The forearm has above 



