<>N THE APPENDICES GENITALES (CLA8PERS IN 1H i; SELAI lllW'S. 



style 1 ) (to judge by the pieces before me this part seems to I" .1 little varying witli to the 



details df tlu- processes). 



As to the muscular system the readei is referred to Raja clavata witli which the other 

 Ra/a-spt :cies agree exactly in most respects. The M. dilatator^ however, is lure somewhat nn 

 distinctly than in the thorn-back separated into two, a largi doi I one, and a smallei ventral one. 



The glandular body, .-is in all Raja-species, is limited to the dorsal side ol tin 

 bag proper, and accordingl) does not continue into the shall. In young pecimens ol tin Skate with 

 undeveloped appendages nol yet reaching the end "I the ventral, the appearance ol tin glam 

 rather deviating from that ol the developed one; il is mure flattened, and tin gland po ead 



in more (lour or more) rows over the greater part ol the surface; in other words, ii shov 

 striking resemblance to the glandular body in Rhina. B) a continued growth oi the marginal por- 

 tions of the gland, and by a strong rounding ol these portions, the surface that in younger anim 

 is provided with pores, will be hollowed, and thus apparently become more narrow, and in this 

 the characteristic deep longitudinal furrow will arise. 



Raja nidarosiensis Collett. 



< »i this species I have had only one paii ol dried ventral skeleton , the appeudb pari oi which 

 had a length of abt. 33"". The principal features agrei exacth with those ol the Skati tin 



blance includes the < 01 on habit of the single skeletal pieces, bul a closei 1 animation ol these will 



show some minor peculiarities in the details; for inst. it will especiall; ea il I" een that th 

 / is bent in a somewhat different way, and has a relatively largei lateral wing, a largei Forward 

 directed tap, and its distal end has not the peculiai shape like the blade oi an axe; on its me 

 surface it is deeplj concave, spoon-like, etc. I shall however omil to give a detailed account ol the 

 deviations of all the pieces from those in the Skate, and leavi toothers, who ma) hav 

 at their disposal, to work out this subject more thoroughly; no doubt the deviations will make - 

 specific characters. According to the existing descriptions oi the species tin append; 

 large, and are said to reach behind to the beginning oi the first dorsal fin. 



Raja clavata I, 



(PI. IV, li; : . 49 52; pi. VI, fig 6; 



This Selachian I think to he the one whose appendio 1 Frequentl) be lined 



and described. Duvernoy 2 ) has briefly mentioned them, then glandular bag with its glandular h 

 and their skeleton, the nomciiclatun oi which In lia formed in accordance vith 

 the parts oi the hind limb and the foot of a mammal. I.at.-i the) havi been 

 Pappenheim3), whose- di cription it is rathei difficult to use on account ol the want ol 



. In 111 \ figure it has bei ; iced a littli ai to reach too fai up on the other ti 



1 Cuviei 1.' ',"n a. 1 an imparl id ed ol 



1 Rech. sur l'anat. comp. de: orgam 'I' la ; ration chez Ii animam vertGbrc Vim 



1859, p. in — 1 17, pi. 3. 



