ON THE APPENDICES GENITALES (CI.ASPERS) IN THE SEIvACHIANS. 



37 



shape to the medial side; to the Up / which in the ScyUia is turned into the fnrrow, corresponds 

 the part in Pristinnis marked with the same letter, to the naked dermal fold i in one corresponds the 

 naked dermal fold / in the other, etc. 



Also the skeleton shows the near relation to the other Scylliidae. Between the basale and 

 the appendix is found (ventralh) a very small, quite rudimentary piece /;, which of course bears no 

 ray; dorsally is found an also very small piece /?. 



The appendix-stem and the marginal cartilages are much like those in the ScyUia. The 

 stem is twisted longitudinally in a similar manner as in Sc. s fella re, but is not bent medially. The 

 dorsal connection of the marginal cartilages, however, is not so close as in the Sc>'llia; the two 

 pieces may here be forced a little from each other. 



The number of terminal pieces is five, if to the terminal pieces we will count a piece, Rd^, 

 which has not been found in any of the Sharks, mentioned in the foregoing; it is joined movabh- to 

 the hindmost edge of the dorsal marginal cartilage, and is situated in the dermal fold below the 

 asterisk in fig. 9. 



Td and 71' are long and narrow, and form at the end of the style a similar kneeshaped curve 

 as in Scylliitiii s fella re (in Sc. caiiieiila it is only indicated); a slightly calcified or almost quite soft 

 piece Z'lr/, is found, projecting forward under the edge of Rd\ Tv proximally forms a rather broad 

 plate, to the dorsal edge of which is attached a leaf-shaped, somewhat bent piece 7",. All the pieces 

 are completely hidden in the skin. 



The muscular system is substantially quite the same as in the Scyllia, the only 

 difference being that the . outer lip-muscle» seems to be still less developed in Pristiuriis. 



Lamnidce. 



Lamna cornubica (Gmelin). 

 (PI. II, fig. 22, 23.1 



In a specimen of the length of 2'" 5""", which in the beginning of November 1897 was driven 

 on shore on the western coast of Jutland, the appendix has a length of 21'='"') and a largest breadth 

 of 4"^'"; the terminal part is 7,5^^'" long. The whole ventral surface is densely covered with dermal 

 teeth quite to the end; this investment ceases with a strongly marked boundary line on the medial 

 surface, which is quite naked to the terminal part; this latter being almost quite covered with teeth 

 until the margins of the appendix-slit, also on the dorsal side; the other parts of the flat dorsal side 

 of the shaft are naked, and these naked parts are laterally marked off from those covered with teeth 

 by a rather deep longitudinal dermal fold. Apparently the appendix-slit from before the terminal part 

 and to a larger foremost opening at the base of the appendix is closed as in the Seylliidcc; but in 

 reality it is open, and for the whole way it is possible, though with difficulty, to press a sufficiently 

 thin sound in between the margins of the marginal cartilages. On the medial side, immediately be- 



I Lillj eb org 1. c. p. 625 gives for a specimen of the length of 2,4m a length of 25Lm for the appendix. 



