1880.] NATURAL SCIENCKS OP PHILADELPHIA. 57 



(fig. 13, 14), but especially on the margin of the wide, gaping orifice 

 and on its inside for a length of about 4.0 mm. (PI. VII, figs. 2-4), 

 with rather crowded and apparently irregularly set claws. The claws 

 were very strong and for the most part broad and high (fig. 3, 4), 

 even reaching a height of about 0.3 mm. (fig. 4). In the interior of 

 the glans, especially in its posterior part (fig. 5c), the claws were less 

 broad and simply uncinate or bifurcated, otherwise mostly broader and 

 with digitations of the margin. The body of the claws was plain or 

 curved ; the end simply pointed, bi- or trifurcate or with digitations, 

 sometimes very strangely formed. They consisted of a cuticula and 

 its matrix ; very often, especially on the outside of the glans, the 

 cuticula was torn off and the (fig. 20) rounded or pointed naked matrix 

 was left. The whitish spherical spermatotheca (PL VI, fig. 19a) was 

 about 3.5 mm. in diameter, laterally communicating tnrough a short 

 petiolus adhering to tne upper end of the vagina, with a sinuosity intO' 

 which opens the elongate, yellowish spermatocysta (fig. 19i), which had 

 a length of about 2.0 mm., and from which issues the long duct of the 

 mucous gland (fig. 19c). The grayish vagina very strong (fig. 18e),. 

 about 7.0 mm. long, elongate-conical; the lowest part wide, having a 

 diameter of about 3.25 mm. ; the walls thick, with a very peculiar 

 internal lining, consisting of cylindrical palisades (PI. VII, fig. 6-8) 

 of a height of about 0.4 by a greatest diameter of 0.07-0.08 mm. ; 

 between the larger were seen smaller and very small ones. The pali- 

 sades seemed to be densely clothed (fig. 8) with cilia, and showed a 

 nearly colorless axis (fig. 6, 8) up to their points ; the axes were often 

 denuded (fig. 6) after the sheath has been torn away. This lining 

 continued up to the superior end of the vagina, but not beyond it. 



The mucous gland large, whitish, and yellowish-white ; the anterior 

 half yolk-yellow, denuded on the fore-end of the genital mass ; the duct 

 short. 



A variety (PI. VI, fig. 14-20) of this species has also been found 

 by Dall, in July, 1873, at low water, in Kyska Harbor (Aleutians). 

 According to Dall the color of the living animal was " yellowish." T he 

 animal preserved in spirits was of a uniform light yellowish color. The 

 length about 18.0 mm. by a breadth reaching 8.0 mm and a height of 

 6.0 mm. ; the breadth of the foot at the fore-end 5.0 mm., the margin 

 of the mantle freely projecting 1.5 mm. ; the height of the rhinophoria 

 ' 1.5 mm., of the branchial leaves 1.5 mm. Around the plain margins 

 of the rhinophor-holes seven to nine large conical tubercles ; the club 

 of the rhinophoria with about twenty leaves Around the branchial 

 5 



