A Revision of the Genus Auliscus Ehrh., &c. By J. Battray. 903 



often circular. — Auliscus radiatus Jan. (not Ehrb.) Abh. Schl. Ges. 

 vater. Cult., 1861, p. 162, pi. i, fig. 6. Eic^odiscus? Peruvianus 

 Kitton in Prich. Inf., p. 938. 



This is not Eu])odiseus radiatus W. Sm. (Syn. Brit. Diat., i, 

 p. 24, pi. XXX. fig. 255) as Janisch has staled with some hesitation, 

 Smith's species being a Biddulphia with a variety of synonyms (see 

 p. 915). Auliscus peruvianus var. (?) ovalis Grun. forma quadri- 

 ocellata, in Weissflog's collections, is typical. 



Habitat : Peruvian guano (Kitton ! Macrae ! Weissflog ! GreviUe ! 

 Eae ! *) ; Patos Island guano (Johnson !) ; Santa Marta deposit 

 (Weissflog ! Deby !) ; Colon, (Deby ! Hardman !) ; Port Seguro, 

 intestine of turtle (Hardman ! f) ; Holothurians, California (Kinker !) : 

 loc. ? (Griffin !). 



Var. tenera nov. — Circular, diam. from • 05 to • 065 mm. Surface 

 with slope at border less evident. Markings more delicate, 8 to 10 in 

 O'Ol mm., those around the roundly elHptical central area more pro- 

 minent; the rows radial, non-fasciculate, those converging to the 

 processes less obvious. Processes 2, round or elliptical, • 0075 mm. 

 broad. 



Habitat : Foreign Ascidia, locality unknown (Firth !). 



Var. spinosa Kitton MS. — Eoundly elliptical, major axis 

 • 135 mm., about l^J^. times minor. Surface rising somewhat steeply 

 to the processes. Central area elliptical, distinctly defined, with major 

 axis almost in line of processes. Markings : apiculi numerous, large, 

 rare, on a narrow band within the border, most distinct in a circle 

 around the border. Processes 2, relatively small, circular, ' 0075 mm. 

 broad. 



Kitton is of opinion that this var. might be united to the genus 

 Biddulphia. 



Habitat : Eio Janeiro (Kitton !). 



P. ralfsianus. — Auliscus ralfsianus Grev., Trans. Mic. Soc. Lond., 

 1863, p. 52, pi iii. fig. 21. 



Eoundly elliptical, major axis from 0-1125 to 0*2 mm., about 1^ 

 times minor, or circular and smaller, • 06 mm. diam. Surface highest 

 on a median oval area extending between the processes, and about 1/2 

 of minor axis broad, with outer edge indistinct, sometimes on this area 

 a depression about half of distance of process from centre, slope to the 

 border gentle. Markings round, granular, 4 in O'Ol mm., rows 

 straight, radial, those converging to each process manifest ; a reticulum 

 of large irregular polygonal meshes, distinct, but sometimes evanescent 

 towards the central side of the processes, the meshes subequal or 

 slightly smaller on the depressed portions of the median area. Border 

 with almost regular radial sharp lines, inner edge finely and irregularly 

 undulate. Processes 2, elliptical, large, • 0175 to ■ 025 mm. broad. 

 — Cerataulus pacificus Grun., Sch. Atl., pi. cxv. fig. 10. Eupodiseus 



* In the Collection of Dr. GrifSn. f Ii the Collection of Mr. Julien Deby, 



