1904. J MARINE FAUNA OF ZANZIBAR. 299 



brown, was a dark coppery red plentifully besprinkled with lighter 

 dots. 



Grube lays some stress upon the permanence of the colour of 

 his E. coccinea in spirit, but this depends upon so many factors, 

 suchas exposure to light, condition of the spirit and even the 

 presence of other specimens in it, that great variation in this 

 respect is inevitable. 



In only one of the Maldivan examples is seen the white collar 

 on setigerous segment number 3 which is usual in those from 

 East Africa. The pigmentation, which has now become brown as 

 in the above, is interrupted by more or less distinct white spots, 

 and the skin is covered by a close network of wrinkles giving the 

 mosaic appearance found in several species. 



Text-fie-. 47. 



A series of sections of the body of -B. coccinea, to show pvoportious in difterent 

 parts. From the largest Maldivan specimen. X 2. 



a. Through second setigerous segment. 

 h. „ middle of gill-region. 



c. „ the point where gills decrease in size. . 



d. „ SLwy part of the posterior two-thirds. 



The foi'm of the body is a characteristic contrast to E. afra, e. g. 

 the body rapidly enlarges behind the head, becoming very bulky 

 in the branchiferous region and then slender again behind this. 

 The ventral surface is flattened, and may become concave in the 

 middle line, but the body is highly arched dorsally throughout 

 its length, the nearly cylindrical posterior portion having very 

 small parapodia. The sections figured (text-fig. 47) show the 

 usual pi'oportions of the body in difi"erent parts, which are also 

 illustrated by fig. 6, PI. XX. In some cases the body is flatter 

 anteriorly, but never so posteriorly. 



The pro- and peristomia and their appendages vary widely in 

 appearance and proportions, not only on account of accidental 

 contractions but also varying Avith the size of the specimen, being 

 better developed in the smallei- specimens from East Africa than 

 in the lai'ge ones collected from the Maldives and Seychelles. 

 The outlines given (text-fig. 48, a & h, p. 300) are from specimens 

 which illustrate the extremes found in this respect. That the pro- 

 portions seen in fig. a are not quite exceptional is shown by the 

 seven large Seychelles specimens, among which they are frequently 

 found together with conditions intermediate between this and 

 fig. b. 



