178 Prof. M'Intosh's Notes from the 



few were mature at the beginning of the month, but the 

 majority were immature or had spawned. This corresponds 

 with the condition in the Neapolitan forms. 



The Annelids mentioned as occurring in April likewise 

 were present in IMay, while there was a decided increase in 

 the larval forms pertaining to other genera. Thus trocho- 

 spheres of Phyllodoce and Eulalia frequently appeared along 

 with young ^lagelonce^ which agreed in most points with the 

 description and figures of Claparede, thougli he does not make 

 it clear that the young MageJona has at first only slender 

 s])ine-]ike papillse on its elongated tentacles, as in Spio, and 

 that the characteristic thick cylindrical ones are developed 

 first at the base. Thus in some pelagic examples about 

 4 niillim. in length (body) both kinds exist on the organs. 

 The young forms referable to ClaparJide's fig. 12, Taf. x.*, 

 seem to be Spio-\\]s.Q^ and show no circulation of corpuscles in 

 the tentacles, while those resembling his fig. 10 have active 

 corpuscular circulation in the tentacles, the distal parts of 

 which are readily lost. Moreover, the former is occasionally 

 considerably larger than the latter. When the circulation is 

 established in the tentacles a small rounded black eye appears 

 at the anterior and iimer border of each tentacle, while two 

 small and indefinite pigment-specks occur on each side of the 

 middle line in front of the mouth and nearly in a line with 

 the outer eyes. Further investigation therefore is necessaiy 

 to clear up the doubtful points. These young examples swim 

 freely, with a wriggling motion, after coiling the long tentacles 

 like a spring, and again settle on the bottom or at the surface 

 and stretch out the two long tapering tentacles. Numerous 

 young Terebellids in the transparent sheaths were common 

 in the bottom-nets. 



The only form observed in the midwater-net during June 

 was Tonwpter{sy\>-\\\Q\\ appeared once in considerable numbers 

 and from 1 to 1^ inch in length. Numerous ova occurred in 

 the perivisceral diverticula of the feet. Chgetognaths were 

 obtained in the same net, but they were comparatively few 

 and small, only the larger forms reaching 15 millim. This 

 therefore diti'cred from the condition during the winter 

 months, when the bay teemed with large and active Sajitta'. 

 The bottom-net was extremely rich as the month advanced in 

 larval forms of Xen'ne. (two species), Polydora, and other 

 Spionidge, such as Magelona. Young Harmothoe imbricata 

 with four scales and seven bristled feet, advanced young of 

 Nephtlii/s with a pair of eye-spots opposite the third bristled 



* Beobach. uber Aual. u. Eutwicklungsgesch. ^^c. (Leipzig', iMWi). 



