b 



1898.] DB. A. DUGES ON A IfEW OPHIDIAN. 539 



Tunafuti and Eotuma ; outer reefs. 



There are two specimens of this species, pieces of much larger 

 masses, the greater part of which has been killed by green algal 

 and nullipore growths. The Funafuti specimen seems to be the 

 edge of a large mass which has died in the centre ; its calices are 

 generally in short series with low coUines. The Eotumau specimen, 

 however, while possibly the edge of a similar mass, has its centres 

 usually arranged separately, with high trabecular coUines. 



I propose to call this species after Savigny, who gave an excellent 

 figure of Psammocora month, to which it is very closely allied. 



EXPLANATION OF THE PLATES. 



Plate XLIII. 



Fig. 1. Halomifra irregularis, upper surface, p. 528. 

 2. Halomitra inegidaris, lower surface. 



Plate XLIV. 



Fig- 1. Siderastrtsa clavws, X 2J, p. 525. 



2. Pavonia repens, X 2 J, p. 531. 



3. Favonia intermedia, X-2:^, p. 53L 



4. Pavonia calicifera, X 25, p. 532. 



Plate XLV. 



Fig. 1. Psammocora haimiana, X 2^, p. .53(i. 



2. Psammocora superficialis, X 2:^^, p. 537. 



3. Psammocora frofundacella, X '1\, p. 537. 



4. Psammocora savigniensis, X '2\, p. 538. 



3. Description d^un Genre nouveau d^Ophidiens, 

 Geatractus. Par Alfred Duces, M.D.' 



[Eeceived June6, 1898.] 



J'ai decrit et figure dans le Journal Mexicaiu ' La Naturaleza ' 

 (2" serie, t. ii. 1897, pag. 455) un Ophidien nouveau sous le nom 

 de Oeo^liis tecpanecus. 



C'aracteres generaux,— Aspect de Calamarien et de Coronellien. 

 Noir a reflets bleus ; dis barres blanches dorsales, courtes et 

 transversales ; un collier blanc passant sur la joue et la majeure 

 partie de la gorge. Sept supralabiales, Se™** et 4^"^ touohant 

 I'oeil, la 5eme la plus grande. Preoculaire unique, tres petite, an 

 dessus d'une freno-oculaire. Deux postoculaires. Temporales 

 l_|-2 + 2 (mal rendues sur la figure). Queue extremement courte, 

 robuste et obtuse. Quinze rangs d'ecailles pourvues en general 

 de deux pores apicaux. Fue pre'auale. Tete 0-025 m., queue 

 0"023 m., longueur totale 0-50 m. Les vertebras dorsales portent 

 une hypapophyse tres nette. 



Mr. G. A. Boulenger a fait de ce serpent un Atractus (Zool. 

 Rec, 1896, Eept. pag. 25), mais les Atractus n'ont pas d'hypa- 



^ Communicated by Mr. G. A. Boulenger, F.Z.S. 



