Gatty Marine Laboratory^ St. Andrews. 25 



Tlongne, gives a dotiiiled description oF its structure. 'V\\c 

 body measures 250 mm., and is divided into an anterior and 

 a posterior region, the latter commencing at the twelfth 

 bristled segment. The hook-rows are short dorsally, long 

 ventrally in the posterior region. There are two pairs of 

 cephalic ganglia, and the great nerve-cords have neural 

 canals. The aliuientary canal has a jjapillose proboscis, 

 o?sop]iagns, oval stomach, and a gut which ternunates on 

 the last segment, the anus having a short ventral lobe. The 

 segmental organs occur in every segment, and probal)ly open 

 between the dorsal and ventral feet, though he found another 

 pore on each side behind it. He did not notice the sexual 

 apertures with the hooks, his example being a female. 

 Externally was a parasitic Loxosoma. 



Heteromastus filiformis, Claparede, again ocenrred in sand 

 west of Salthonse Lake, Plymouth {Allen). The cephalic 

 region agrees with that of the type (Claparede), and so with 

 the proboscis, which has clavate papilhe. The body reaches 

 the length of 6 cm., and there are over one hundred segments. 

 The digestive and the perivisceral systems agree with 

 Capitella. The anterior segments are short and broad, tlie 

 posterior long and narrow. The anterior bristles are winged, 

 the posterior with the characteristic hooks dorsally and 

 ventrally. 



All that is known of the coloration of Casicirrus neglectus, 

 Arwidsson (of the family Maldanidai), a species by no 

 means uncommon, is the remark by Cunningham and 

 Ramage * in their " Polychaet Fauna of the Firth of Forth," 

 that in their " Axiothea catenata the colour is pinkish, i)ale 

 towards the anterior eud, with broad bauds surrounding the 

 body at intervals." The region whence these authors drew 

 their supply has since altered its character, probably from 

 pollution, so that a careful search v.as unsuccessful. It 

 lives gregariously in tubes of sand-particles sunk in the 

 sand. In examples from Wales f the anterior end of the 

 Annelid is somewhat pale, though the median vessel causes 

 a streak along the dorsum, the blood at the same time 

 tinting the cephalic plate. In front of the third bristle-tuft 

 the region has a smooth and glistening cuticular coat, which 

 is iridescent, and at the segment-junction in front of the 



* Traus. Roi . Sue. Ediu. vol. xxxiii. p. 679 etc. (188S). 



t I am indebted to Mr. Arnold Watson for living examples. 



