IMPEEFECTLT-KNOWN OSTEACODA. 189 



side (fig. 6) ; copulatory organs large and massive (fig. 20), the vasa deferentia very 

 distinct and wide. Postabdominal laminae (fig. 7) short, with three Very slightly 

 curved, unequal, feebly pectinated claws. All the appendages of the animal are 

 symmetrically blotched here and there with patches of red pigment. 



Ilab. Pulo Penang. One specimen, ^ . 



The genus Heterodesmiis, instituted many years ago for the reception of a single 

 species taken in the China Sea, has in general form, thouoh not in minor characters, a 

 very marked resemblance to this species. It was described, however, from a single 

 dried shell, from which the soft parts of the animal had almost entirely disappeared, 

 so that it is impossible to say whether or no it might be properly referable to the 

 genus here described. 



Family SARSIELLID^ Brady & Norman. 



Genus Saksiella Norman. 



Saesiella C?) orjVIThoides, sp. nov. (Plate XXIII. figs. 16-21.) 



Shell of the female, seen from the side, elongated, much produced both before and 

 behind (fig. 16), fully twice as long as broad ; anterior extremity produced into a 

 subquadrate prominence which is about one-half the width of the valve and sub- 

 truncate or only slightly rounded in front, posterior forming a truncated conical 

 protuberance; dorsal margin flattened, irregularly sinuated throughout; ventral margin 

 boldly arcuate in the middle, sloping almost in a right line to the posterior extremity 

 and forming a deep sinus beneath the anterior prominence; seen from above (fig. 17) 

 elongated, subovate, more than twice as long as broad, with broadly mucronate 

 prominences before and behind. Surface of the shell smooth, with a slight median 

 longitudinal depression. Length 1 mm. Swiraming-setse of tlie antennae very faintly 

 plumose, but bearing fine marginal spines (fig. 19) ; secondary branch rudimentary, 

 simple, digitiform, granulated (fig. 19). Postabdominal laminse with two strong but 

 almost straight toothless spines (tig. 21) and a few small setae anteriorly. 



Hah. Trincomalee, Ceylon. One specimen only. 



The characters of the caudal laminae seem to associate this species with Sarsiella, 

 the shell also bearing some distant resemblance to that genus, but its position here 

 must be regarded as purely provisional. 



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