CRUSTACKA MAJ.ACOSTRACA. 



45 



Remarks. According to Alcock an exopod is well developed on the external maxillipeds of 

 Engysteuopus and Richardina, while it is quite rudimentary in Spongicola (in X Koehleri Caullery I 

 have been unable to find even a rudiment); in Stenopus the third maxillipeds possess an exopod. The 

 new genus Spongicoloides is more allied to Spongicola than to the three other genera in having no 

 exopod on the third maxillipeds, but it differs sharply from all in having no exopod on the second maxilli- 

 peds (according to my own observation Spongicola has a well developed exopod on n/xp 2 ). In Spongi- 

 coloides the shape of the carpus and the chela of the third pair of trunk-legs is nearly similar to that 

 in Richardina — consequently very different from Spongicola and Engystenopus — but in Richardina 

 the distal joints in the two posterior pairs of trunk-legs are again divided into joints, while they are 

 undivided in Spongicoloides. But the branchial formula differs extremely from what is found in the 

 other genera named. These possess two arthrobranchise and an epipod on mxps and trl 1 to trl\ but 

 in Spongicoloides the same five pairs of appendages have only a single arthrobranchia (the anterior 

 being absent), and besides fr/ 1 to trl* have no epipod. Finally, in Spongicoloides the branchiae of the 

 trunk-legs are less developed, with their branches much shorter (PI. IV, fig. i i) than for instance in 

 Spongicola. — In general aspect this interesting new genus shows more resemblance to Richardina 

 (according to Alcock's figure of that form) than to any of the other genera. 



37. Spongicoloides profundus, n. sp. 



PL III, figs. 5a-5k; PI. IV, figs. 1 a— ll. 



Description. The carapace, which is of very thin texture, is moderately short, slightly com- 

 pressed and dorsally vaulted, with a number of small spines scattered on the anterior two thirds of 

 the dorsal surface and on the anterior third of the lower part of the sides. The rostrum, which reaches 

 only to the end of the basal antenuular joint, is irregularly serrated above (figs. 5b, 5c, 5d), in two 

 specimens with respectively three and two, in a third specimen with no spines on the lower edge 

 behind the acute tip. The eyes are of moderate size, with whitish pigment; the short eye-stalks have 

 no spines. 



The antennal squama (fig. 5 f) is slightly more than twice as long as broad; the distal half or 

 two fifths of its outer margin has 4 — 6 teeth, and the arched front margin overreaches the apical 

 marginal spine. Third maxillipeds somewhat shorter than trl 1 ; their ischium and merus distinctly 

 broadened. 



The first three pairs of trunk-legs are truly chelate. First pair (figs. 1 d and 1 e) slender, 

 shorter, slightly more than half as long as the third pair; second pair only a little shorter than the 

 third, reaching about to the base of its movable finger, but its distal half is much more slender than 

 that of the third pair. Third pair (fig. 1 f) with the carpus somewhat more than twice as long as 

 broad; the chela is nearly as long as the sum of ischium, merus and carpus, besides extremely slender, 

 being 5 1 2 times as long as broad. Fourth and fifth pairs of legs (fig. 1 g) have the carpus even a 

 little more than twice as long as the propodus, and both joints show no vestige of subdivision; the 

 terminal part of these legs is shown in fig. 1 h. 



The abdomen is smooth, only the telson has two considerably diverging longitudinal rows of 



