The Embryology of Chlamydoselachus 



portion on the inside of the tube. The insides of the walls are crossed by minute striae, be- 

 tween the laminae, which appear transverse, but in reality are spiral and ultimately — 

 following the outlines of the anterior or posterior borders — terminate, forward and back- 

 ward, in the longitudinal folds of the tube itself. The inner edges of the laminae are set with 

 minute pores. Near the middle of its length there is a deeper transverse groove. This is 

 crossed by the laminae without change in their directions on its account. The plates are not 

 distinct from each other through the whole of their length ; branches frequently cross obliquely 

 from one to the other. The bottoms of the grooves between them have closely-set transverse 

 partitions. The walls of the gland are thicker anteriorly; they begin abruptly or even extend 

 a little in front of their points of attachment to the tube. The appearance is such as would 

 result from twisting the inside walls of the duct very closely for a short distance. In this we 

 have a hint as to the origin of the gland. 



551 



Text-figure 13 

 Interior of the shell gland of the frilled shark, Chlamydoselachus anguineus. Note the laminated structure. 



Printed from the original woodcut after the drawing by Paulus Roetter for Garman, 1885, Fig. C, pi. XX. 



This is not very clear nor does Carman's figure (Text-figure 13 herein), devoid as it is 

 of explanatory lettering, help matters much. However, both must be reproduced here; 

 the text because it is the only full description ever published, and the figure because it 

 is the only one on record. 



This gland has also been studied and described by Hawkes (1905) and it seems well to 

 quote her brief description. She gives no figure. 



For the first 6 cm. the oviduct is a straight tube, the walls of which are Uned with 

 numerous laminae. This region passes into the oviducal gland, the walls of which are much 

 thickened, except along two longitudinal lines which are approximately dorsal and ventral. 

 The length of the gland is 3 cm. Its interior is covered by fine laminae continuous with those 

 in the preceding and succeeding portions of the oviduct. The laminae run spirally, and are 

 very close together, instead of longitudinally and somewhat separated, as is the case throughout 

 the remainder of the oviduct. The transverse deeper groove in the oviducal gland mentioned 

 by Garman was found in the specimen examined. Passing from the oviducal glands, the 

 oviducts regain their original diameter, but the walls are smoother, the laminae being reduced 

 to slight striae. 



