38 Mr. W. T. Caiman on 



Pandalus brevirostris, Heller, Crust, siidl. Europa, 1863, p. 247, pi. viii. 

 fig. 9 ; A. Milne-Edwards, Recueil de Fig. de CrustactSs nouveaux 

 ou peu cormus (1883)*. 



Rostrum (PI. I. fig. 4, a) about half the length of the 

 carapace, straight, pointed at the tip. Above there are 7 or 8 

 spines (the latter number is more common), of which 4 or 5 

 are on the carapace. Two (or rarely three) of the most ante- 

 rior are not separated from the rostrum by articulation. 

 Below, the rostrum bears 2, 3, or rarely 4 minute teeth. 



The flagella of the antennules are much longer in the male 

 than in the female. In an ovigerous female with the carapace 

 4 millim. long the flagella were about 2*5 millim. in length. 

 In a male with a carapace of 5 millim. the flagella were 

 nearly 10 millim. The basal lobe has its anterior margin 

 free from setae. 



The antennal scale (PI. II. fig. 4, b) is comparatively short 

 and broad and only a little narrowed towards the tip. 



The third maxillipeds (PI. II. fig. 4, d) are slender and 

 the terminal joint is twice the length of the preceding. The 

 exopod is wanting. 



The second peraiop>od (PI. III. fig. 4,/) on the right side 

 is rather short and stout, reaching beyond the middle of the 

 antennal scale. The carpus is divided into four joints by 

 three articulations, of which the proximal is situated beyond 

 the middle of the joint. The chela is more than half the 

 length of the whole carpus. The left leg of the second pair 

 reaches beyond the tip of the antennal scale, and the carpus 

 and merus are divided by numerous annulations as in the 

 other species. The third pair reach beyond the tip of the 

 antennal scale, while the last pair fall a little short of it. 



In the Jirst pleoptod of the male the endopod (PI. IV. 

 fig. 4, h) is rather triangular in shape, the internal process 

 forming the apex, from which the outer edge curves gradually 

 to the base, with only an indication of the outer lobe so well 

 marked in the other species. The appendage resembles that 

 of the female so much in general shape that it is difficult at 

 first sight to distinguish the sexes by this character. In the 

 second pleopods of the male the appendix masculina is a little 

 shorter than the appendix interna. 



There are about 8 pairs of spinules on the telson. 



Size. — Length of our largest specimen about 25 millim. 



* 1 have not seen this figure, the plate containing it being absent from 

 the copy of this very rare work presented to our Museum by Prof. Milne- 

 Edwards. 



