The Anatomy of Chlamydoselachus 



435 



a pair of mesonephroi are usually of equal length, but in specimen No. II (Text'figure 88) 

 the left mesonephros is shorter than the right. In most cases the mesonephroi thin 

 out so gradually at the anterior end that the anterior limit can be made out only after a 

 careful examination. 



F.I). 



LT.S. 



RA. 



A.P.- 



Text'figure 90. 

 Diagrammatic figures of the cloaca in female (A) and male (B) .specimens 



of Chlamydoselachus. 

 A.P., closed abdominal pore; Bl., so-called bladder (urogenital sinus); L.Ov., left oviducal open- 

 ing; R., rectum; R.A.P., functional right abdominal pore; R.G., opening of rectal gland into 

 the rectum; R.Ou., right oviducal opening; R.S., seminal vesicle; Ug., urogenital opening; 

 Ur., opening of ureter into urogenital sinus; U.S., urinary sinus of female (one sinus is omitted 

 from the drawing); V.S.I, openings of urinary sinuses into the cloaca; V.D., vas deferens 



(ductus deferens). 

 After Hawkes, 1907, second text-figure, p. 476. 



In Table II are shown the lengths of the mesonephroi in my specimens, together 

 with the ''over'all" length of the body and the total length of the body cavity. In Table 

 III the ratios of length of mesonephros to body length and to length of the body cavity 

 are expressed in percentages. From an inspection of Text'figures 85 to 88 it will be seen 

 that specimen No. IV is sexually immature, No. Ill is nearly mature, while Nos. I and 

 II are fully mature. The variations shown in Tables II and III are too small to be signif- 



TABLE II 



Length in millimeters of the mesonephros of the female Chlamydoselachus compared with the total 

 length of its body and the entire length of its body cavity. The specimens are arranged in the order of 

 sexual maturity. 



Specimen Number 



IV. 



III. 



I. 



II. 



Total Length of Body 

 Length of Body Cavity 

 Length of Mesonephros 



1398 

 554 

 486 



1550 

 634 

 554 



1350 

 588 

 518 



1485 

 686 

 605* 



*This applies to the right mesonephros only. In this specimen the left mesonephros is shorter; its 

 length is 541 millimeters. 



