NEREIS. 145 



Its motions denote violence. It seems to construct a very slight cover- 

 ing of small particles and a glutinous secretion, under which it reposes. 



A specimen spawned very profusely on July 23, when a multitude 

 of ova, the merest specks, were observed whitening the water. It was 

 previously round and turgid, but flattened and thin afterwards. 



Perhaps this is the Nereis alba of Miiller, represented Zool. Dan., 

 v. ii. p. 29, Plate LXII. figs. 6, 7 : " Caput absque oculis, palpis aut ten- 

 taculis." 



Marine. Shore. 



PLATE XX. 



FIG. I. Nereis teres. 



1. A. Another specimen. 

 1. B. Section of 1. A. 

 2. Proboscis of fig. 1 . 



2. NEREIS (NEPHTYS), HIRSUTA. Plate XXI. Figs. 1, 2. 3. 



The nature of the species of Nereis, now referable to the genus 

 Nephtys, is somewhat more explicitly illustrated in the next article. 



The present Nereis hirsuta extends three inches, including a spine, 

 by which the posterior extremity terminates. The shape of the body is 

 somewhat quadrangular, divided into numerous segments, four of which 

 are enlarged. Plate XXI. fig. 2. In place of the usual pencil of bristles 

 there is an appendage, whereon is a long prominence, bordered by a super- 

 ficial row of short bristles above. 



Neither tentacula nor eyes were visible in a single specimen which 

 came from Zetland, and was never vigorous. 



PLATE XXI. 



FIG. 1. Nereis hirsuta. 



2. Section of the body, enlarged. 



3. Appendage on the segment, enlarged. 



