THE EGG-CAPSULE. 



35 



sule (fig. 1 6), differs widely from other 

 recent forms. It has thus a remark- 

 ably long tail-sheath; is provided with 

 a distinct type of lateral web, for its 

 rugae are few in number and restricted 

 to the region of the trunk-case, and 

 there are no conspicuous rugae arising 

 from the hinge of the opercular flap, 

 dividing a precardinal from a post- 

 cardinal lateral web, as in the other 

 forms. 



These differences are so striking that 

 I am quite convinced that this capsule 

 represents a new genus.* Carman 

 himself tells us nothing of its antece- 

 dents, and as he on one page refers 

 7 7 to it as belonging to Callorhynchus 

 antardicus and on another to Callo- 

 rhynchus callorhynchus, I infer that he 

 attributes it to the latter species and 

 that he regards these terms as synony- 

 mous. 

 Chimaera. 



Capsules somewhat tadpole-shaped, with 

 large trunk-sheath, short snout-, and long, 

 tapering tail-sheath; lateral web narrow, with 

 rugae faint, if present at all. Opercular flap 

 extends forward to end of case; serrulae pres- 

 ent, beginning far forward, a part of the 

 complicated apparatus of opercular ridges 

 (</. pi- in, fig. 17, A, B, c) ; caudal pores 

 many, opening on both dorsal and ventral 

 sides. A dorsal keel present. Capsules thin, 

 parchment-like, smooth or slightly ridged. 

 The species differ in well-marked details, t-g-, 

 in width of lateral web, length of tail-sheath, 

 modeling of trunk- and snout-case, texture, 



Fig. 16. Chimeeroid egg-cap- - 



sule. Mid-Pacific. (Ventral number of serrulse, etc. If arranged in a corn- 

 aspect.) After Carman, parative series (ff. table, p. 30, and figs- 17, 18, 



About two-thirds natural size. .. /~ //. . 



t-. ,-, r , ,,,. 21, 22), C. colliei stands closest to the type of 



rig. 17. Egg -capsule ot C-ra- . * 



maera monstiosa. Norway. Carman's capsule, and C. mitsukunt is ob- 



(Ventral aspect.) Natural size. vious l y the mos t specialized. 



*This might be christened and specified by a systematist who does not hesitate 

 ultimately to complicate Chimaeroid literature in the matter of synonyms. It may be 

 long before a new Chimaeroid is fished from the mid-Pacific and it maybe a century 

 before this can be satisfactorily fitted to "Carman's capsule." Let us therefore pro- 

 visionally refer to such capsules according to the names associated with them thus 

 under Callorhynchids we may refer to the " Martinez capsule, " "P^ron capsule, "etc. 



