156 



Circeis obtusa, n. sp. 



Plate ix., figs. 8 to 17. 



The body is rather broad, convex, the surface is rather 

 rough, with granules becoming well developed on the pleon^ 

 glabrous. 



The head is not so pointed as in other species of thia 

 genus; rather short, anteriorly strongly declivous, with an 

 anterior faint transverse ridge. 



The eyes are well developed. 



The epimeral plates of the thoracic segments are not dis- 

 tinctly marked off from the segments. They are vertical in 

 direction. 



The anterior portion of the pleon is short. The posterior 

 portion dome-shaped, with a very slight depression each side 

 of a median faint elevation. The posterior notch is well 

 marked, narrower at its apex than at its base, with a V- 

 shaped median lobe, which reaches about halfway to the end. 

 In a side view the end appears slightly turned up. 



The epistome has its anterior portion slightly convex. 



The basal joint of the antennular peduncle has a distal 

 notch whose posterior limb does not reach the end of the 

 second joint; the anterior limb is nearly as long as the pos- 

 terior, and is slightly turned forward at its apex. The third 

 joint is narrow and slightly longer than the second; the 

 flagellum has 11-12 short joints of a moniliform appearance. 



The flagellum of the antenna has 13 longer joints. 



The mandibles are large, the primary plates are well 

 developed and dentate ; the secondary plate also is well deve- 

 loped, as also are spine rows and molars. 



The maxillipeds have the plate of the second joint as 

 long as the joint itself; the palp is well developed. 



The legs are strong. The first gnathopoas have well- 

 developed spines on fourth, fifth, and sixth joints. In the 

 other legs the spines are replaced mostly by the furry pads. 



The first pleopods have short endopods, much broader 

 than long. The exopod is without marginal teeth, or with 

 only one or two faint ones. Internally, from the usual row 

 of marginal setae, there is a row of setules, as noticed in other 

 species. Second pleopods, with the endopods also short, bear- 

 ing the aiwfndi i\, nearly halfway along its internal border. 

 The appendix is thick, and nearly of the same diameter its 

 whole length. The exopod has 4-5 small teeth on its ex- 

 ternal border and a row of setules. The exopod of the third 

 pleopods has a division and a row of setules, as in the others. 

 The exopod of the fifth pleopods has three lobes, which are 

 slender, the most distal one projecting horizontally, the most 

 proximal close to the inner margin. The division is very 

 obscure. 



