The Embryology of Chlamydoselachus 571 



sumably the "larger" of the two oblong eggs recorded in Dean's notebook. Its asym' 

 metry is probably not the result of handling, as might be surmised, but was impressed 

 upon the egg while the capsule was being formed. The long curved process measures 

 about 30 mm. to the fork of the tendrils and these extend out about 15 mm. further. The 

 capsule is everywhere traversed by line longitudinal striations which converge at the left 

 end and run out onto the long tendril'bearing process. The raphe, seen on the side of 

 the egg next the observer, is very large and heavy. It runs out on the process which is 

 plainly twisted to the left. 



In the Dean collection of frilled'shark material in the Department of Zoology at 

 Columbia University is a large somewhat asymmetrical ellipsoidal egg which deserves 

 description. It measure 90 mm. long x 57 deep and has on it an embryo 71 mm. long. 

 The large yolk mass has become split open by the action of the preservative and the result- 

 ing expansion has split the capsule along that raphe near to and somewhat parallel with 

 the body of the embryo. At the end of the egg near the tail of the little fish I can find no 

 evidence of a process. At the other end near the head of the fish is a process (broken off 

 from the capsule) which, as hardened by the preservative, is quite flattened. 



This process is shown in Figure 13, plate I. In nature, the basal part is about 17 mm. 

 long and about 8 mm. wide. Each of its outer edges is constituted of the end of a raphe. 

 Between these raphe-formed edges, in the flat body of the process, about seven horny 

 strands can be made out with the aid of a magnifying glass. This process is very like that 

 on the egg shown in Figure 2, plate I. The outer end of the process is split in two and 

 each half breaks up into a twisted mass of fine tendrils. Here as in Figure 2, plate I, the 

 raphes form a part of the tendril mass, exactly as they do in the egg cases of certain skates 

 and European small sharks ("dogfishes'"). 



In the first plate of Dean's figures is a separate drawing (Figure 14, plate I) which 

 shows such a very much frayed-out process. This process seems also to be flat and to have 

 the raphes forming its outer edges. It breaks up into one large and three small tendril 

 masses. The larger at the base seems to be constituted of about 10 string-like bodies. 

 The other three tendrils are separate and grade in size from outside in, the innermost 

 being the smallest. The larger tendril mass seems to have had a filament cut off at the 

 second bend, one tendril only remaining. Of the three others the median one seems to be 

 broken up into two. The outer and inner tendrils are of about the same length. All are 

 much crumpled. It seems not improbable that this drawing was made from such a process 

 as that described in the preceding paragraph. Since the striae run onto the processes, one 

 wonders what part they play in the formation of the strands in the process and of the 

 tendrils. One wishes for fresh material here. 



An Elongate Infertile (Wind) Egg 



Last of all of Dean's drawings of elongate eggs is the wind egg portrayed in color in 

 Figure 51, plate V. It is hardly ellipsoidal but it is elongate and it has a long tendril- 

 bearing process as may be seen in the figure. It was presumably drawn in natural size. 



