28 DE. W. T. CALM AN OX XEW OE EAEE 



believe, be found to be not uncommon among the Cumacea. Sars describes (Crust. 

 Norway, iii. p. 6) the anterior part (exopod) of the branchial apparatus as uniting 

 with its fellow of the opposite side to form " a funnel-shaped tube," and in his 

 description of Nannasiamcs longirostris (Arch. Math. Naturvid. iv. p. 122) he states 

 that this species differs from all other Cumacea in having two distinct siphons. This 

 is a point which is very difficult to determine in preserved specimens, especially if the 

 dissection has to be directed to the examination of other characters as well, but I have 

 observed it in Cumacea belonging to widely distinct families and am inclined to suspect 

 that it may even prove to be the rule. I hope to return to this point on a future 

 occasion. 



Occurrence. — Gulf of Siam, " Between Koh Mesan and Cape Liaut, 5-9 fathoms," 

 " Koh Kam, 5-10 fathoms." Th. Mortensen Coll., Copenhagen Museum. Co-types in 

 British Museum. A solitary young specimen was obtained by Prof. Plerdman in the 

 Gulf of Manaar and is referred to in my Report on his collection (Rep. Ceylon Pearl 

 Fisheries, Royal Society, pt. ii. (1904), Suppl. Rep. xii. Cumacea, p. 160) as 

 " Bodotriidse n. g. and sp." 



Iphinoe sp. 



Two immature specimens of a species of this genus, the larger only 4-4 mm. in length, 

 are in the collection from the Gulf of Siam. In having the carapace more than twice 

 as long as deep they differ from all the species hitherto described except I. serrata 

 Norman (non Sars) and /. hrevipes Hansen. The latter has the carapace three times 

 as long as deep, and differs widely in many other characters. With I. serrata the 

 present specimens agree in having a series of teeth on the outer edge of the basis of 

 the first pair of legs. In co-typical specimens of Norman's species the carapace is two 

 and a half times as long as deep, but in a specimen from the Mediterranean which I 

 refer to this species the proportion approaches that of the Siamese specimens, where it 

 is about two and a fifth. Other characters, such as the longer last segment of the 

 antennular peduncle and the shorter and stouter uropods, may perhaps be due to the 

 immaturity of these very small specimens, to which, for the present, I prefer not to 

 assign a specific name. 



Occurrence.— Gn\i of Siam, "Koh Kam, 10 fathoms, 4/2/00," "Between Koh 



Mesan and Cape Liant, 5-8 fathoms, 7/2/00." Th. Mortensen Coll., Copenhagen 



Museum. 



Family VAUNTOMPSONIID.E. 



Dr. H. J. Hansen has suggested (Isopoden,Cumaceen, &c. der Plankton-Expedition, 



p. 57) that this family ought probably to be united with the preceding. I have also 



discussed some facts pointing in the same direction (Cumacea of Siboga Exp. p. 8). 



For convenience, however, the name is here retained pending a general reconsideration 



of the classification of the Cumacea. 



