622 Bashford Dean Memorial Volume 



a reasonable conclusion that the disintegration of the ring, seen in process of going to 

 pieces in Figure 10, plate I, has gone on to completion. Not enough of the venous system 

 is shown to justify description. 



Although, as stated above, I have never been so fortunate as to study the progressive 

 development of the yolk-vascular system on an elasmobranch egg, I have done so on 

 the large-yolked 20-mm. egg of the gaff-topsail catfish, Felichthys feUs. Here was found the 

 same artery coming out from under the head of the embryo, bifurcating to form the arterial 

 ring. Then a venous system developed as in the sharks, with a main trunk coming in under 

 the tail of the embryo. The closing of the arterial ring was very like that in elasmobranchs. 



THE ADULT CHLAMTDOSELACHUS AKGUITiEUS 



At the head of Dean's ''List of Figures" is this notation, "Adult — natural color" 

 and on the line below "Adult — photo of head, lat. & ventral". The photographs 

 — old, dark, and faded — I find. But, instead of a drawing of an adult in "natural color", 

 I find drawings of two adults — a male and female shown in lateral aspect — and two draw- 

 ings of the head, in dorsal and ventral aspects. The drawing of the head in lateral aspect 

 was not needed since both adults were portrayed in this position. Presumably these 

 specimens are shown in "natural color". 



These figures are all reproduced on plate VI, which has been reserved for the adult 

 stage. With the reproduction and description of these drawings, the life history of 

 Chlamydoselachus anguineus as portrayed in Dean's drawings and recorded in his frag- 

 mentary notes will have been adequately figured and followed, and we will then have seen 

 how correctly Samuel Garman named it the cloak-gilled snake-like shark. 



AN ADULT FEMALE FRILLED SHARK 



Such a Chlamydoselachus is portrayed in what is presumably natural color in Figure 

 52, plate VL There is no record of its length and no indication as to the scale on which 

 this figure is drawn. The original drawing measures 603 mm. to the broken-off tip, and 

 with the tip completed — 614 mm. (24.2 in.). A glance at the plate shows that the 

 drawing of the female (614 mm.) is longer than that of the male (538 mm.) by 76 mm. 

 (about 3 in.). This is to be expected. The female (shark or bony) fish is generally larger 

 than the male. Gudger and Smith (1933, pp. 262-263, Tables IV and V) were able to 

 record the lengths of 35 female specimens of Chlamydoselachus ranging from 610 to I960 

 mm. (24 to 77-2 inches) — and averaging 1532 mm. (60.3 inches). They could find measure- 

 ments for only 15 males. These ranged from 920 to 1650 mm. (36.25 to 65 inches) and 

 averaged 1293 mm. (50.9 inches). However, one has to see the tables (Article V. of this 

 volume, pp. 262-263) to have it made clear that the females uniformly run larger than the 

 males. The largest male measured 1650, the next one but 1474 mm. There are 16 females 

 ranging between these limits of the males, and there are 10 females ranging between 

 1670 and 1960 mm. The females average considerably larger than the males. This is 



