Mr. J. Blackwall on newly discovered Spiders. 421 



convexis, suturis canaliculars ; anfractu ultimo soluto ; apertura 

 circulari. 



IIab. Takauo-Sitna ; 2^ fathoms. Tabu-Sima ; 25 fathoms. 



2. Scaliola arenosa, A. Adams. 



S. testa turrita, rimata ; anfraetibus convexis, arenosis, suturis pro- 

 fundis ; anfractu ultimo ad peritrema coutiguo ; apertura vix cir- 

 culari. 



Hab. O-Sima; Tanabe; Simoda. 



3. Scaliola glareosa, A. Adams. 



S. testa graciliori, turrita, imperforata, alba ; anfraetibus convexis, 

 arenosis, suturis impressis ; anfractu ultimo ad peritrema consoli- 

 date ; apertura ovata. 



Flab. Tsu-Sima; Takauo-Sima. 



4. Scaliola gracilis, A. Adams. 



S. testa turrita, gracili, alba, subarenosa ; anfraetibus convexis, sub- 

 nudis, suturis profundis ; anfractu ultimo vix soluto ; apertura 

 subcirculari. 



Hab. Gotto; 71 fathoms. 



XLVII. — Descriptions of newly discovered Spiders captured in 

 Rio Janeiro by John Gray, Esq., and the Rev. Hamlet Clark. 

 By John Blackwall, F.L.S. 



[Continued from p. 360.] 



Family Thomisid^e. 



Genus Thomisus, Walck. 



Thomisus gibbosus. 



Length of the female /^ths of an inch ; length of the cephalo- 

 thorax y^ ; breadth — ; breadth of the abdomen | ; length of 

 an anterior leg ^ ; length of a leg of the third pair ¥ . 



The eyes are disposed on the anterior part of the cephalo- 

 thorax in two transverse curved rows, forming a crescent ; the 

 two anterior intermediate ones are the smallest ; the eyes of each 

 lateral pair are seated on tubercles, and the anterior ones are the 

 largest of the eight. The cephalothorax is short, broad, convex, 

 slightly compressed before, rounded on the sides, abruptly sloped 

 at the base and in front, where it is truncated; it is sparingly 

 clothed with hairs, and has a yellowish-brown hue, with dark 

 reddish-brown spots; the frontal margin, a transverse line be- 

 tween the two rows of eyes, and another situated behind the 

 posterior row, which is slightly angular with its vertex directed 



