372 MRS. E. w, SEXTOX ON A [Apr. 28, 



matter. In the table given of the Gammaridfe, he brackets to- 

 gether as closely related " Siibfamilia 4. PTioxhta (Phoxides, 

 Spence Bate), and Subfamilia 5. Trischizostomatina (Prostomata; 

 A. Boeck)" — "partes oris appendiculares non tubiformes " in 

 Pho.rina, and " tubiformes " in Trischizostomatina. 



In 1867, Costa again refers to Gtierinia in the catalogue of the 

 Crustacea sent to the Paris Exposition (6) and gives the plate 

 promised but not included in the ' Fauna di Napoli.' 



Inl870 Boeck jDublished his 'CrustaceaAmphipodaBorealia'(7), 

 a synopsis of the larger treatise then being prepared for the press. 

 In this work he alters his pi-evious classification of the group, 

 the former tribe Prostomatce, being reduced to a family of the 

 Gammaridse. The diagnoses here given of the family Prosto- 

 inatidcB with its one genus Trischizostoma and one species 

 T. raschii are repeated in the later work, ' De Skandinaviske og 

 Arktiske Amphipoder' (8), where Boeck again emphasises the 

 resemblance to the Hyperina, and to the Orchestidce and Lysianas- 

 since among the Gammarina. 



Boeck records the capture of several specimens, all females, by 

 Storm, in the Throndhjemsf jord, " parasite on a shark " — length 

 from rostrum to telson of the largest specimens 25-30 mm. ; and 

 of "one very young one" taken by himself trawling in the 

 Christianiaf jord, at the depth of 60 fathoms. 



Sars in the ' Oversigt af ISTorges Crustaceer,' 1882 (9), follows 

 Boeck's classification, giving under Tribe II. Gammarina, Fam. I. 

 Trischizosto7nidce, one genus, Trischizostoma, one species, T, raschii. 



In 1885, Carus in his ' Pi-odromus' (10) places Guerinia in the 

 subfamily Phoxince. of the Gammaridse between the genera 

 Lilljehorgia Sp. Bate, and Gamm.arus (Fabr.) Sp. Bate. His 

 description appears to be a literal translation of Spence Bate's 

 definitions (4). He notes G. nicceensis as peculiar to the 

 Mediterranean faiina. 



In 1886, Bovallius (11) established a new tribe Synopideo., 

 intermediate between Gammaridea and Hyperiidea, in Avhich he 

 placed the family TriscMzostomatidce. He gives full descriptions 

 and figures of the adult female and a young male (5 mm. in length) 

 of Trischizostoma raschii. The peculiar aspect of the first 

 gnathopods he discovered to be due to torsion in the adult, being 

 wholly absent in the young form. 



About 20 young specimens were taken by Bovalliiis in July 

 1871 at Tj<?)t't0, Norway, 20 miles south of the Polar Circle, in 80 

 fathoms ; in July 1880 he found some adult females, " parasites 

 on, or in company with, an Asterias " in Hardangerf jord, S. W. 

 Norway, in 250 fathoms, the largest of these measuring 22 mm. 

 He mentions Capt. Collin as having obtained specimens from the 

 west coast of Novaya Zemblya. 



Stebbing in 1888 (12), in his introduction to the 'Challenger' 

 Amphipoda, p-. xix, wi'ites : " A connection between the Hyperina 

 and the Lysianassidje has already been indicated by Boeck, who 

 placed the family Prostomatidse at the head of the Gammarina,, 



