93 



The third maxiUipedes are pediform and slender ; the ischium 

 is long, and bears a row of strong teeth ; the merus has a single 

 large spine near the distal end of the inner margin. 



The chelipeds are long and robust ; the fingers especially are 

 very much elongated ; the merus, which is strongly compressed, 

 bears a row of five or six teeth on the lower margin, and a single 

 distal tooth above. The carpus is short and unarmed. The 

 upper surface of the palm bears two crests, each of which ends 

 distally in a tooth near the base of the dactyl. The fingers 

 are long and compressed, and covered with tufts of setae. The 

 fixed finger has its cutting edge serrate throughout ; the proximal 

 half of the dactyl, however, is quite smooth, and in the distal 

 portion only very minute serration is present. At the base of 

 the fixed finger there is a single large tooth. The fingers are 

 not in contact except in their distal portions ; the tips cross 

 one another. The fingers are not quite twice the length of the 

 palm . I 



The following pairs of pereiopods are slender ; the second 

 pair are chelate, the others simple. 



The pleopods, except the first pair, are biramous, and have 

 a small and slender appendix interna, furnished with booklets. 



The outer margin of the exopodite of the uropods bears two 

 or three spines, the distal one the largest ; the endopodite has 

 only one spine in a position corresponding to the large one of 

 the exopodite. The latter has an oblique suture near the tip. 



Branchial formula : — ^. '^ . _ ^ 



— VII. \t:ii. IX. X. XI. XII. XIII. xiv. 



Podobranchs. ep. r + ep. 1+ep. 1 + ep. 1+ep. 1+ep. ep. — 



Arthrobranchs — r 22222 — 



Pleurobranchs . — — — — — — — — 



On the first abdominal somite there is a pair of simple ap- 

 pendages, the tip of which is expanded in the manner usual 

 in male Decapods. This structure, howxver, is found in all adult 

 specimens, and both the male and the female genital openings, 

 on the coxae of the fifth and third pereiopods, respectively, 

 are always present. 



In 1909 Wollebaek published a paper calling attention to 

 the fact that Calocaris Macandreae was normally hermaphrodite. 

 The union of sexes is not confined to the outward characters 

 alone, but extends to the internal sexual organs ; in each speci- 

 men there are to be found testes, and also ovaries. Wollebaek 

 examined more than fifty specimens in the Bergen Museum, 

 all of which exhibited hermaphroditism. 



This species was taken by the Helga on several occasions, 

 and in fairly large quantities. The specimens agree entirely 

 with Wollebaek's results. The male and female openings are 

 distinctly developed, and I have dissected several specimens 

 and found both testes and ovaries present. 



