340 ON A COLLECTION OF ECHIURIDS, WITH AN ATTEMPT TO 



case of the genus Thalassemia where the number of species is some twenty. The key 

 is based on one suggested by Lampert, and in the main depends on the number of 

 nephridia and on the number of bundles of longitudinal muscles, where such exist. 



I agree with Lankester that there does not seem sufficient reason to separate Horst's 

 Hamingia glacialis from the Hamingia arctica of Koren and Daniellsen, so that this 

 genus is left with but one species, whilst as to Saccosoma but one specimen has ever 

 been seen. 



The various species are arranged in the following list, alphabetically. The con- 

 tractions in the references to literature are those suggested by Mr D. Sharp, the Editor 

 of the Zoological Record. 



GENUS I. BONELLIA. Rolando 1 . 



Luigi Rolando, Professor of Anatomy in the Royal University of Turin, dedicated 

 this genus to his colleague, Andrea Bonelli. who was Professor of Zoology at the same 

 University and Sub-Director of the Museum of Natural History. 



Species 1. Bonellia minor. Marion. 



Rietsch. Etudes sur les Gephyriens amies ou Echiuriens. Thesis. Geneva, 

 1886, and Recueil Zool. Suisse, Vol. III. p. 313. 



Length of body 1*5 to 3 cm. Length of proboscis when extended some 20 cm. 

 Colour, dark green. 

 Longitudinal muscles continuous. 

 Nephridium, single, usually to the left. 

 Anal trees ramify but once before ending in funnels. 



Male with recurved and pointed hooks, not ciliated on the back, which is transversely 

 marked or ringed. Larva with a venoral sucker. 



Locality. Bay of Naples and Marseilles. 



Species 2. Bonellia pumicea, Sluiter. 



Sluiter. Natuurk. Tydschr. Nederl. Ind. Vol. L. Ser. 8, Vol xi. 1891, p. 111. 



Described from a single specimen. 



Length of body of female 5 mm. Length of proboscis about the same, but can be 

 stretched to 1 cm. 



Colour, light green with a reddish shimmer, the proboscis is milk white. 



Papillae are in the form of light white spots, and are mostly aggregated at the two 

 poles of the body. 



1 Hem. Ac. Turin. Vol. xxvi. 1821, p. 539. 



