Fishes of the Western North Atlantic 561 



surface grooved longitudinally, each rriargin with a row of smalTsharp thorns curving 

 downward. First dorsal fin triangular with acute apex. Separation between first and 

 second dorsals nearly as long as pectoral fin. Second dorsal subtriangular anteriorly, 

 its posterior portion lower and sloping rearward, separated from origin of caudal fin 

 by a considerable interspace. Caudal fin about as long as pectoral, only about V10-V12 

 as wide above caudal axis as below and tapering gradually to narrow tip. Pectorals and 

 pelvics shaped much as in the Chimaeridae; pectorals much larger than pelvics and 

 longer than head, omitting proboscis. 



Horizontal diameter of eye only about 1/5 as long as head, omitting proboscis. 

 Roof of mouth sculptured in complex pattern close in front of anterior plates, a series 

 of short and stiff transverse folds bordering anterior dental plates and anterior half of 

 posterior plates on each side. Tongue close-set with small papillae. 



Margins of dental plates more or less rounded. Anterior upper plates subtriangular 

 (apex forward), strongly cupped, with one broadly rounded longitudinal ridge (tritor) 

 along inner margin. Posterior upper plates much larger, their anterior part nearly flat 

 transversely, posterior part somewhat cupped, either with two narrow longitudinal 

 ridges (tritors) or with one broader ridge, with more or less distinctly notched anterior 

 end. Lower dental plates also either with one broad longitudinal ridge or with two 

 narrower ridges. ^^^ 



Denticles in a double row on midbelt of back from close in front of dorsal spine to 

 level of front of eye, in U-shaped pattern anteriorly; small specimens with a double 

 series also, extending part way from first dorsal toward second dorsal; denticles also in 

 interspace between second dorsal and caudal, these tending to disappear with growth; 

 skin of trunk wholly naked elsewhere; no denticles on claspers; but lower anterior 

 surface of frontal tenaculum with recurved thorns, and anterior convex face of prepelvic 

 tenacula with a number of large complex denticles, each with several cusps. ^^^ 



Lateral mucous canal tubular after hatching; jugular, oral, and angular mucous 

 canals all meeting suborbital canal separately; suborbital and cranial canals extending 

 out along proboscis, the pair on each side joining near tip; angular canals also running 

 out along proboscis lower down (Fig. 127 A). A well marked furrow below front of 

 head, running from beside rear end of outer part of upper lip around in front of each 

 nostril, but interrupted between nostrils. 



Egg Capsules. The egg capsules,^-* described as 170— 420 mm long, are smooth 

 on one side, furry on the other. A great number of hair-like filaments dot the lateral 

 flanges densely though irregularly and extend out beyond the margins to form a more 



122. See Norman (Discovery Rep., i6, 1937: 35) for variations in the grinding ridges in C. callorynchus. 



123. For more detailed accounts and illustrations of the accessory sexual organs of the male, see Leigh-Sharpe (J. Morph., 

 36, 1922: 207, fig. SB [frontal tenaculum], 20S-209, figs. 9, 10 [clasper], 209-21 1, figs. 11,12 [prepelvic tenaculum]). 



124. We have examined capsules from Chile and from Peru, their identities established by close resemblance to others 

 that have been taken from the parent fish (Graham, Trans. Proc. roy. Sec. N. Z., 6() [3], 1939: 362; Whitley, Fish. 

 Aust., J, 1940: 46, 237) or have been seen protruding from the oviducts ready to be deposited. See Dean (Chimaeroid 

 Fishes, Publ. Carneg. Instn., 32, 1906: 32-34, figs. 1 5-: 5F) for reproductions of earlier illustrations of egg capsules; 

 see also Parker and Haswell (Textb. Zool., 2, 1897: 182, fig. 805) for illustration of egg capsule with embryo far 

 advanced in development. 



36 



