I. '08. 156 



Aegeon Lacazei (Gourret). 



PI. XXII, figs. 1-5. 



Crangon Lacazei, Gourret, 1888, PI. xii, figs. 19-23; 



PL xiii, figs. 1-10. 

 Aegeon Brendani, Kemp, 1906. 



The rostrum is short, depressed, and about half the length 

 of the eyestalks ; it is very deeply emarginate apically and 

 provided near the base with a pair of small, semi-obsolete 

 lateral spinules. The carapace is very strongh^ convex, deeper 

 than broad, and furnished with seven dentate carinae, of which 

 the three lateral pairs are curved in dorsal view. The spine 

 at the outer edge of the orbit is but little longer than the 

 rostrum, but the antero-lateral angle is very strongly pro- 

 nounced and reaches considerably beyond the eyes. The 

 median carina of the carapace bears four strong forwardly 

 directed teeth , of which the third is the largest ; the first lateral 

 row consists of six teeth w^hich decrease in size from before 

 backwards, the hindmost, however, not being reduced to mere 

 spinules as in the case of A. cataphr actus . The second lateral 

 carina terminates anteriorly in the antero-lateral angle ; it is 

 interrupted in its anterior third by a depression which runs 

 from the back of the orbit towards the branchial region. In 

 front of this depression the carina is represented by a single 

 spine; another spine, which is situated immediately behind 

 the sharp antero-lateral angle, appears more properly to be- 

 long to the third lateral row\ Posterior to the depression the 

 carina is divided into six or seven teeth ; the anterior of these 

 is sharp, but the others are semi-obsolete and in most speci- 

 mens are little more than nicks in the carina. The third 

 lateral carina, which runs close to the inferior margin of the 

 carapace, consists of a stout anterior spine (mentioned above), 

 behind which is a row of very obscure spinules which very fre- 

 quently are scarcely perceptible. 



The ahdominal somites are all finely and sharply sculptured. 

 The first somite bears a pair of dorsal carinae w^hich are pro- 

 duced anteriorly to sharp forwardly directed teeth ; outside 

 these is a short interrupted carina, bearing two small but 

 sharp teeth, which continues the curve of the first lateral 

 carina of the carapace ; the second lateral carina is also con- 

 tinued on to this somite, w^here it is represented by several 

 blunt elevations. The second somite bears in its middle a 

 stout forwardly directed dorsal spine. The third and fourth 

 soinites are each furnished with three dorsal carinae, of which 

 the two outer are posteriorly divergent. The fifth and sixth 

 somites are armed with a pair of dorsal carinae, outside 

 of which traces of a second pair are visible ; the median pair of 

 the fifth are slightly divergent posteriorly ; those of the sixth 

 are parallel, notched so as to show two pairs of backwardly 

 directed spines, and posteriorly carried back beyond the edge 



