ON THE APPENDICES GENITALES (CLASFERS) IN THE SEIvACHIANS. 6l 



long cylindrical process, reaching with the point into the ventral recess'), which is here situated far 

 backward, almost terminally (L7')\ on the dorsal side are seen the two same recesses 2) as in the Skate, 

 but of different size and extent, as well as the projecting lamella Rd' i) borne by the skeleton; the 

 only new thing that does not seem to be represented in the Skate, is a strongly projecting part sup- 

 ported by the skeleton, rt'cz-t), which i3art belongs to the ventral side; it corresponds to the porous, 

 spongy, firm dermal fold in the Skate, where, however, no skeleton is found. 



The Skeleton. Between the basale and the appendix-stem (; Metatarsien» Moreau [Cuv., 

 Duvernoy]) there is a (^, bearing the last six rays, a (^^ without rays, a flat ;? with s-shaped edges, 

 proximally connected with b^, and distally by means of a joint with the appendix-stem 5). This latter 

 is about (scarcely) twice as long as B -^^ b^^ -\- b,, and closely behind the two proximal articular sur- 

 faces for i^2 and /9 it becomes flattened, and ends with a quite flat, thin-edged, hindmost rounded part; 

 corresponding to the great length of the terminal part, the uncalcified estyle; (aine sorte de phalanges 

 Moreau |etc.|) forms the greater part (about two thirds; in my figure it is a little too short); also here 

 is found, about at the middle of the medial edge, a thickened and somewhat calcified part. The 

 marginal cartilages are large, plate-shaped; the dorsal one reaches farthest forward, but behind it 

 ceases much before the ventral one; the dorsal cartilage sends forth into the interspace between the 

 terminal pieces a long, firmly calcified, s-shaped and pointed, blade-like process, bent in an undulating 

 way, and with sharp edges {Rd\ fig. 50). 



The terminal pieces are 5 (6), to which is still to be counted a covering piece '^). This (d) is 

 situated dorsally, is flatlv rounded on the outer side, concave towards the terminal part, whose prox- 

 imal portion it covers; anteriorh- it is curved in an oblique, half-moon-shaped manner, having the 

 lateral fore corner far drawn out; from this corner it shows an elevation running towards the medial 

 edge, and indicating the place of attachment of the J/, dilatator \ consequently the whole part before 

 this line is covered bv the muscle. Td'i) has a broad line of attachment with the distal edge of the 

 dorsal marginal cartilage, but only touches the appendix-stem; outward it is somewhat flat, inward 

 concave; its lateral edge is convex, and somewhat indented; its distal end is attached to the appendix- 

 style by soft tissue, representing the cartilaginous bridge in the Skate. The piece TV^ found in R. 

 batis is wanting here. Tv is a long, slightly bent piece *), provided with a short, hook-like point, and 

 having before a short articulation with the distal end of the ventral marginal cartilage, medially a 

 long connection with the appendix-style, reaching until the thickened and calcified place in this latter; 

 laterally it is for a rather long way connected with a bayonet-like Tt'a?); this latter is connected with 

 the hindmost lateral edge of the ventral marginal cartilage by an oblique articulation , and distally it 



1) Petri cic. 



2) Petri a la, alp. 

 j) Petri pr. 



4) Petri da. 



5) Petri, fig. I C, bi, ^2, r ; Moreau (= Cuvier-Duvernoy): Tibia, astragale, calcaneum; basale — femur. 



6) Petri: scli < schuppeiiformiger KnorpeI>, «gr6ssere Schuppenlamelle > ; Moreau: Cartilage interne, no. 3, fig. 27, 

 1. c. p. 250. 



7) Petri: sch, likewise < schuppenf. Knorpel, kleinere Schuppenlamelle* (p. 312); Moreau: Cartilage externe, no. 2. 



8) Petri: st\ Moreau: Cartilage no. 6 bis, cartilage en cuilleron. 



0) Petri: bj\ «ein bajonettahnliches , gedrehtes Knorpelstiick . (p. 313); Moreau: Cartilage en hallebarde (Du- 

 vernoy), no. 6. 



