184 Notes from the Gatty Marine Laboratory. 



mentioned by Max Scliultze, by the ' Cambridge Natural 

 History,' and by Gravier. Max Schultze * gives a circum- 

 stantial account of finding female examples in April at 

 Greifswald with ciliated eggs and pear-shaped larvae in the 

 body-cavity, and he figures two of the latter, hundreds of 

 which occurred in the cavities at the bases of the feet. His 

 figures, however, give rise to doubt as to the nature of the 

 ciliated forms, which have the narrow end of the pear 

 anteriorly with the two eyes at some distance behind it. 

 In one, indeed, the mouth is indicated behind the eyes as a 

 small radiated disk. The posterior end of the larva is broad 

 and rounded. In the light of the condition at St. Andrews 

 doubt arises as to correctness of the interpretation, more 

 especially in view of the structure of the larva; but it is 

 right to give a margin for possible variations in regard to 

 internal fertilization under certain circumstances. Yet it 

 seems unlikely. 



The foregoing interpretation as to the mode of reproduction 

 would seem to be most in accordance with observation, since 

 on the 28th May masses of clayey mud brought from the 

 habitat of the species and with the annelids in situ showed 

 many free ova amongst the mud coating the walls of the 

 tube, and, further, of various postlarval examples. 



EXPLANATION OF THE PLATES. 



PLA.TE Vl.t 



Fig. 1. Ventral view of the head of a porbeagle shark, 9 feet long, 

 showing the rounded tip of the hyoidean apparatus {a) pro- 

 jecting from its smoothly finished aperture. 



Fig. 2. Aspect of the same region fi-om the interior of the mouth. 



Fig. 3. Lateral view of the preparation, indicating the projection of the 

 hyoidean boss. 



N.B. — The first figure is drawn to a larger scale than figs. 2 and 3, 

 which are nearly equally reduced. 



Plate VII. 



Fig. L Third right arm of the large Ommastrephes sngittatus, d'Orb., 

 showing the keel to the left, the web with its supporting rays, 

 and the suckers. A portion of the web has been removed. 

 Slightly reduced. 



* ' Entwickelung von Arenicola piscatorum nebst Bemerk. iiber Ent- 

 wickel. and. Kiemenw. 1856, p. 214, Taf. ix. figs. 11 & 12. 



t I am indebted to the Carnegie Trust for these figures, those of 

 PI. Vll, and four of PI. VIII. 



