35 



dusae, and upon which the genus was originally based, differ in several 

 important particulars from the forms living on the sea bottom (which I 

 call Heteralepas). M. Gruvel argues that the characters are adaptive 

 and not of generic significance; yet strangely enough, he adopted the 

 genus Gymnolepas Aurivillius, which was based upon one of the medusa 

 parasites, and is really a species of Alepas as that genus was originally 

 understood. In this case I am satisfied to have shown clearly the dis- 

 tinctions between the two groups. I have demonstrated that the name ^/e- 

 pas belongs to the Medusa parasites. I am content to leave to students of 

 cirripedes the question of whether Heteralepas is to be considered of ge- 

 neric value. After all, the conceptions of genera are ever changing. 

 Linnaeus would have called all these creatures ,,Le/j«.s". 



It has given me little pleasure to refute the criticisms of an author 

 to whom all students of cirripedes are deeply indebted. In concluding, 

 I am glad to be able to say that his contention that Conchoderma be- 

 longs to the lepadine series seems to be well founded. I was probably 

 wrong in placing that group in the Alepadinae. 



Philadelphia, July 1910. 



2. Two cases of abnormal hearts and one of an abnormal Anterior 

 Abdominal vein in the frog. 



By Chas. H. ODonoghue, B. Sc. F.Z.S. Assistant to the Jodrell Professor of 



Zoology, University College, London. 



(With 3 figures.) 



eingeg. 18. Oktober 1910. 



The abnormality about to be described was obtained during class- 

 work dissection in this college. It was apparently a normal specimen 

 of an adult male frog [Rana teniporia). On removing the ventral part 

 of the pectoral girdle however, it was seen that the heart was in quite 

 an abnormal condition i. Instead of being of the usual shape it was a 

 bilobed structure 18 mm long, one lobe of which was situated in the 

 position normally occupied by the front end of the heart and the other 

 ran forward from this inclining to the right, thus coming to lie under- 

 neath the hyoid bone and between it and the muscles on the ventral 

 side of the head (Fig. 1). It was not attached in any way to the sur- 

 rounding tissues, although it had a membranous covering, in all proba- 

 bility the pericardium, and was apparently kept in place by the veins 

 and arteries connected with it. The anterior lobe which was 8,5 mm 

 wide by 8 mm long proved to be the ventricle and from it was given off 



1 This was noticed by Miss Gamgee who kindly handed the specimen to me 

 for examination. 



3* 



