56 MR. T. SCOTT ON EXTOMOSTRACA 



The mouth-organs are as in Scolccith^'lx, except that the anterior foot-jaws are each 

 provided with two jieculiar appendages, consisting of a moderately stout filament bearing 

 an oblong conical head, which appears to be composed of dense fibre-like tissue (fig. 13). 

 The posterior foot-jaws are furnished at the extremity with a few hair-like papilliferous 

 filaments (fig. 14). The swimming-feet are as in Scolecithrix, but the first four pairs 

 difi"er in the form and amount of their armature (figs. 15, 16). The fifth pair has the 

 second joint of the left foot elongate ; the basal part of the joint is greatly dilated, and is 

 furnislied interiorly with a spiniform appendage which terminates in a small apical seta ; 

 the third and fourth joints are small and slender ; both branches of the right foot are 

 2-jointed and furnished with small digitiform terminal processes (fig. 17). The abdomen 

 is composed of four segments, the first l)eiug rather shorter than the others. Caudal 

 stylets short, each bearing four moderately long, plumose, terminal hairs (fig. 18). 



Habitat. Lat. 1° 55' 5" N., long. 5° 55' 5' E. In two gatherings, one from 360 fathoms 

 and one from 160 fathoms. Collected during the middle of the day, January 22nd. 



Variety similis. (PL IV. figs. ]9-23.) 



This is a form which occurred along with the other in the gathering from 460 fathoms, 

 and which, though closely resembling it, yet diff'ers in a few points. It resembles 

 AmaUoj^hora dnbia, es^^ecially in the form of the fifth pair of feet, but differs considerably 

 in the proportional length of the joints of the anterior antenute and of the segments of 

 the abdomen, as will be observed by comparing the figures of the variety with those of 

 the species. 



Amallophoka eobusta, n. sp. (PL IV. figs. 24-29.) 



Female. Length 3 mm. (l-8th of an inch). The body is robust, with a rounded forehead 

 and a small rostrum. The anterior foot-jaws are jorovided with a number of terminal 

 filaments, the majority of which are comparatively short and possess ovate conical heads, 

 while three of them are stout and moderately long and resemble those in Scolecithrix 

 (fig. 25). Posterior foot-jaws as in Scolecithrix, except that the first joint in each is 

 furnished with a short and stout filament having an ovate pointed head like the smaller 

 filaments of the anterior foot-jaws. The swimming-feet are similar to those of Amallo- 

 fhora magna, but the terminal spines are long, and finely seri'ate on the outer edge, and 

 plain on the inner edge. The fifth feet are small, simple, and 2-jointed; a large setose 

 spine springs from the inner margin, and a small spiniform seta from the outer margin, 

 of the last joint ; ^\hile a plain spine, smaller than that on the inner margin, springs from 

 the inner part of the rounded ai^ex, as shown in. the figure (fig. 28). Abdomen comj^ara- 

 tively small, 4-jointed, the segments subequal. Caudal stylets about half the length 

 of the last abdominal segment, and furnished with four apical plumose setae. 



