1880.] NATURAL SCIENCK8 OF PHILADELPHIA. 61 



spermatocysta (fig. 66) quite imbedded in and concealed by the mucous 

 gland, only a part of its chief duct free on the surface of this last ; 

 the spermatocysta scarcely shorter than the spermatotheca, pear-sluiped, 

 incurved ; the duct to the mucous gland (fig. Qd) passing from the end 

 of the bag, the other strong, longer (tig. (^c^, opening in the duct of 

 the spermatotheca, where it begins to be wider (vagina) ; the vagina 

 (fig. Ge) rather wide, but short. The mucous gland whitish, yellowish 

 and dirty yellow. ^ 



2. L. varians, Bgh. PI. XI, fig. 1.3, 14; PI. XIII, fig. 1. 



L. varians, B. R. Bergh, Malacol. Unters. 1. c, 1878, p. 613, 014. 



Color cu?rulescens vel albescens vel flavescens. 



Dentes laterales margine interno denticulati fere usque ad apicem, 



Hab. Oc. Pacif. (Ins. Kyska). 



Of this species six specimens were taken by Dall, in July, 1873, at 

 Kyska Island, on sandy ground, at a depth of 9-14 fathoms. Four 

 specimens were sacrificed to the anatomical examination. 



According to Dall the color of the living animal is " bluish." The 

 animals preserved in spirits were of a uniform whitish color, so too 

 the rhinophoria and the branchia. Their length was 9-12.0 mm. by 

 a breadth of 5.3-7.0 and a height of 3-4.5 mm. ; the breadth of the 

 foremost part of the foot 3.6-5.0 mm. The height of the rhinophoria 

 reached about 2.2 mm., of the branchial leaves 1.0 mm. 



T he form almost entirely as in the typical form and as in the L. 

 hystricina. 'i he head as in the last species ; also the openings of the 

 rhinophor-holes, with their (mostly three) larger tubercles, set with 

 equal spaces ; the club of the rhinophoria Vf-ith about twelve to fifteen 

 rather thick leaves. The tubercles of the back as in the L. hystri- 

 cina ; the number of larger ones much exceeding that of the smaller, 

 which are scattered between them. The branchial disk as in the L. 

 hystricina, also the branchial leaves, whose number did not surpass 

 twelve to twenty. The foot as usual. 



The central nervous system (fig. 1) nearly as in the L. hystricina. 

 The cerebro-visceral ganglia of roundish or oval form, as also the 

 pedal ones which were not much smaller than the former. The com- 



1 In my "Malacolog. Unters." (Semper, Philipp. II, ii, Ileft xiv, 1878, 

 p. 60G-G13 ; Tab. Ixiv, tig. 13, 14-1'> ; Tab. Ixv, fig. 1-.5, G-13) I have given 

 some anatomical remarks on the typical L. bilaviellata and ou the Green- 

 landic variety {D. liturata. Beck). 



