DIATOMACE^E— MR FRED. KITTON. 409 



Tribe 3. Cryptoraphide^e. 



Family 1. BIDDULPHIEiE. 

 1. TERPSINOR 



Terpsinoe, Ehr. 



T. musica, Ehr. Amer. 1843; Kiitz. Bacill. 128, t. 30; id. Sp. Alg. 119 ; 

 Pritchard Infus. 859, t. 11, f. 47. 



Soeotra. Not uncommon. 



Distrib. Vera Cruz, Jamaica, Caraccas, abundant in thermal springs ; 

 Mauritius, parasitic on barnacles living on a ship's bottom. 



2. CERATAULUS. 



Cerataulus, Ehr. 



O. socotrensis, Kitton in Journ. Linn. Soc. xx. 514, t. 48, f. 1. 



Frustulo ventro adspecta cylindrico cingulo dense punctata valvulis circularibus vel late 

 ellipticis leviter bullato infra 2-4 processas marginales ; striis delicatis prope marginem 

 radiatim per reliquum superficies valvuli compacte sed irregulariter dispositis ; setae 3 vel 

 plurae in medio setae. Diametro - 0023 to - 0028 pollie. 



Frustule in front view cylindrical, cingulum very finely punctate ; valves 

 circular or broadly elliptical, slightly bullate below the marginal processes, 

 which vary from two to four in number, striae delicate, radiating near the 

 margin, closely but irregularly disposed on the remainder of the valve ; three 

 or more short setse occur midway between the centre and circumference. 

 Diameter 0023 to 0028 of an inch. 



Soeotra. 



Distrib. Java. 



Since I described this species I have (loc. cit.) found it in a gathering 

 made by M. Julien Deby in a running stream on the slope of the volcanoes of 

 Pangeroon and Jedeh, Java, at an elevation of between 4000 and 5000 ft.; the 

 majority of valves have three processes, on those with two only they are 

 frequently not opposite to each other. Grunow, in his paper on New 

 Diatoms from Honduras, Monthly Mic. Journ. 1857, p. 165, pK cxvi., described 

 and figured a Cerataulus much resembling the above as a var. of C. Icevis 

 (C. Icevis var.? chinensis), but his figure (3 e) representing the striae x 1540 

 diameters do not agree with those on C. socotrensis under a similar magnifica- 

 tion. 



TRANS. ROY. SOC. EDIN. VOL. XXXI. 3 F 



