No. 104.] 139 



well-formed head with appendages, buccal segment with tentacular 

 cirri, five setigerous segments witli feet and cirri, and anal segment 

 with anal cirri which are relatively longer than in the adult ; other- 

 wise they do not differ from the adult except, of course, in size and 

 number of segments. 



Common on shelly bottom, 10-15 feet. 



AUTOLYTUS {Gruhe) Mu-renseller. 



Makenzeller. Zur Kentniss der Adriatisclieu Annelideu, etc., Zweiter Beitrag, 

 p. 37. 1875. 



AuTOLYTUs HESPERiDUM Clopurede. 



Claparede. Aunel. Chet. du Golfe de Naples, p. 530, pi. xiv, fig. 1. 1868. 

 Webster. Annel. Chast. qf the Virgiuiau Coast, p. 225. 1879. 



JIale. 



No adult males were found, but in one specimen, though not de- 

 tached, the following modifications of structure had occurred : 



Head slightly convex in front ; eyes very large, but not quite in 

 contact ; lateral antennae arising from the front margin of the head, 

 just before the anterior eyes, bifurcate at their outer third, swollen 

 at base, three times as long as the head ; median antennte arising 

 back of the eyes, near the posterior margin of the head, one-third 

 longer than the head ; buccal segment hardly distinct from head, 

 bearing two pairs of tentacular cirri, of which the upper had about 

 the length of the lateral antennae, the lower, of the median ; second 

 segment with ordinarv dorsal cirrus ; no sexual sette. 



This species was very common from just below water mark to 

 fifteen feet, living on certain forms of sea-weed. In number of 

 individuals it probably surpassed any other species of Annelid found 

 in the harbor.* 



Fam. NEREIDS. 



NEREIS (L.) Cuvier. 

 Nereis limbata Ehlers. 



PLATE (III), Vr, PIGS. 21, 22. 



Ehlers. Die Borstenwiirmer, p. 567. 1868. 



Verrill. Invert. Animals of Vineyard Sound, etc., pp. 318, 590, pi. xi, fig. 51. 



1874. 

 Webster. Annel. Clia?t. of the Virginian Coast, p. 235, pi. vi, figs. 70-75. 1879. 



Male. 



The dorsal cirri ot the first seven segments have a peculiar form, 

 which seems to' have escaped notice. Near the end they are slightly 



* Regarded by Prof. Langerhaus as identical with Autolytus prohfer Gbube. (See 

 Ze^tschrtft/ilr WissenschafUicheZoologie. p. 574, 1879.) 



