Rev. H. Clavk on a new species of Spider. 329 



catory orifice. The arrows define the position and the boundaries 

 of the breathing-chamber. 



Fig. 6. Planorbis corneas, Lamk., taken out of its shell, a, respiratory 

 siphon ; b, space embracing the mantle ; c, outline of pulmonary 

 chamber ; d, d, abdominal segment of the body. 



Fig. 7. Plan of branchial chamber of Sejna officinalis, a, expiratorj' siphon ; 

 b. and arrows, inspiratory fissure ; c, bottom of the branchial 

 cavity ; d, plan of the hollow cones of the branchiaj ; e, the open 

 hollow bases of the branchise by which the water enters the inte- 

 rior of the organ. 



[To be continued.] 



XXX. — Notice and Description of a Neiv Species of Spider. By 

 the Rev. Hamlet Clark^ M.A., Curate of All Saints, North- 

 ampton. 



To the Editors of the Annals of Natural History. 



Gentlemen, Northampton, Oct. 16, 1855. 



Mr. Blackwall has for many years selected your Magazine 

 as the medium for communicating to the public his many dis- 

 coveries in British arachnology ; this is my reason for applying 

 for admission into the same pages of an additional species which 

 appears to be new to our lists. 



I am. Gentlemen, faithfully yours, 



Hamlet Clark. 



Salticus Blackwallii. 



Length 4 lines ; length of cephalothorax 1| ; greatest breadth 

 1 ; length of posterior legs 2| ; of second pair 3|. 



Legs, especially the anterior pair, robust, setaceous ; on the 

 inferior surface of tibiae and metatarsi of first and second pairs 

 two rows of sessile spines ; legs ochraceous, on the upper sur- 

 faces an irregular row of black spots ; the fourth pair is longest ; 

 the second pair slightly shorter than the third. Tarsi termi- 

 nated by two black curved claws. Palpi ochraceous. Cephalo- 

 thorax large, convex, somewhat quadrate, rounded at the sides 

 and base, slightly pubescent ; the anterior part, where the eyes 

 are seated, black ; the sides and posterior part ochraceous, with 

 black spots and radiating irregular lines converging to the 

 centre ; lateral and posterior margins narrow and black ; frontal 

 margin clothed with longish yellow hairs. Fakes short, vertical, 

 subconical, marked with a short black streak on the outer side. 

 MaxillcE straight, short, enlarged and rounded at the extremity, 

 marked with dark spots on the inner margin. Lip oval, base and 



