CEPHALOPODA --MASSY. 



161) 



space for ahout two more pairs proximally, and possibly one or t\vn inure distallv. The 

 crystalline tnherdes uf I lie vent ral maul Ic. which commence at ils margin <>n either 

 side of the liase of t lie t'liiuiel. extend TO a distai ice ol a limit s nun., or aboul one-third 

 of the length of the mantle. The latter is very much crumpled. Inn (he epidermis 

 shows indications ol a lew dark chromatophores <>n the dorsal snrlace. and a lew are 

 present on the hack of each chili. The radula (Fig. 40) is so delicate that ii was verv 

 difficult to mounl without injury, and some of the teeth cannot lie seen dcarlv. The 

 median teeth have a central denticle not so long as in 'I', -iillinir, II'KI antarctica, Chun, 

 and are without lateral cusps. The outer lateral teeth are of the curved daw-like 

 shape usually seen in this tooth among Cephalopods. The specimen from Station I.".'.) 

 also has the third arms much longer than the rest, its suckers heing arranged in 

 two rows. The latter were examined alter a heavy thunder-shower, when tin 1 liidit was 

 unusually clear, and seemed l<> have ipnte smooth rings. The lar^e suckers of the 

 dull appear to lie larger in proportion to the rest in this specimen, which slightly 

 exceeds the other in size, and their rin^s have part of the circumference smooth, and 

 about nine teeth on the distal margin. The small suckers of 

 the chili, which are placed in four rows distally. have a 

 papillary area, luit the actual ring appears to he smooth. 

 \\ hat seems to lie a minute sucker is present on a tentacle- 

 stem. Tin- tubercles extend to aliout 1-1 mm., and con- 

 sequently occupy aliout the anterior half of the ventral 

 mantle, thirteen being at one side and sixteen at the other. 

 A few large oblong cliroinatupliores are present on the 

 mantle : those on the hack of die dnh are arranged as in 

 Issd's (n/>. <-it.. pi. 10. tig. 4:!) very similarly si/ed specimen e.g.. a large median 

 and two lateral rows of smaller chromatophores. The chief difference in these two 

 examples from the type, ami from the Japanese specimen described by Chun, is that 

 the large tentacular rings have teeth only on the distal border, while Issel describes 

 them as extending all round the ring, and Chun's illustration (<>/>. at., pi. ,")!'. tig. _') 

 represents them as being quite smooth. 



Fie. -in.- -Pyrgopgis pacificus, 



radnla. x 3o<>. 



Dimensions in Millimetre*. 



I'Jnd <>t litnlv tn mantle-margin 



Kvf and ]icdiinclc . 



Fin-length . . . . 

 Breadth arn.ss iin> 



;'.rd arms 

 Ith amis 

 Tclitarlc 



Club . 



I 'en . 



Distribution. Betweeii Tali 



station iL'li. Stiition 139. 



ca. L'7 



i 



8 



ca. 4 

 <. 1 -50 

 ca. i:> 



15" S.. 1(!7 4.",' \V. 



(Issel ): Japan (Chun ): ( ' I A 1 1an tie. a damaged specimen I Chun ). 



