68 Miscellaneous, 



of the forehead. The species, G. viridisy was found in Ascidia intes- 

 tinalis. 



2. Ceratrichodes, Hesse. 



Male. Body clavate, narrow, elongate. Thorax of six segments, 

 exclusive of the cephalothorax ; abdomen of eight segments, which 

 are very close and imbricated, with short rigid liairs at their posterior 

 margins ; abdominal appendages terminated by long and straight 

 hairs. Eye ? Footjaws : first long and slender, armed with a claw ; 

 the rest shorter and of equal thickness. Natatory feet biramose, 

 garnished with spines and hairs. Opening of the genital orifices very 

 apparent, with a corneous and denticulated border. Antennae fur- 

 nished at base with a very broad, flat, rounded appendage, covered 

 with bristling hairs. 



Female. Body pyriform, short. Abdomen short, with only three 

 segments ; abdominal appendages broad and flat, of moderate size, 

 armed with four crooked claws. No eye. 



The single species, C. albidus, occurs in a social Ascidian, of a red 

 colour, which is found as a gelatinous layer on Zoster a. 



3. Ophthalmopachus, Hesse. 



Male, Body long, narrow, claviform ; thorax of five segments, 

 including cephalothorax ; abdomen of five segments, terminated by 

 two appendages of moderate length, garnished with delicate divergent 

 hairs. Antennae short, thick, truncated at the end, and covered with 

 hairs. Mouth unknown. First and second footjaws broad and 

 short. Thoracic feet double ; outer cylindrical one attached to a 

 very thick femoral joint. Eye very large. 



Female. Body short and thick ; cephalic shield cordiform ; thorax 

 of five segments, including the first ; abdomen of three segments, 

 the last terminated by two appendages of moderate size, with short 

 divergent hairs. Antennae thick and short ; eye very large. 



The single species, 0. rnher^ is found in a reddish compound 

 "Ascidian, which forms a thin shining coating on Zostera oceanica, 



4. Platvthorax, Hesse. 



Female. Body broad and clumsy ; cephalic shield rounded, fol- 

 lowed by three segments preceding a considerable enlargement on 

 each side, destined to contain the ova. Between these there is a flat 

 process, widened and emarginate behind, which supports a narrow 

 cylindrical abdomen composed of five or six segments, terminated by 

 flat appendages of moderate size, with rather short, divergent hairs. 

 Antennae slender, uniform in thickness, with numerous hairs. Eye 

 inferior, in the middle of the frontal margin. Thoracic segments 

 turned in at the margins ; thoracic feet biramose. 



The only species, P. albidus, inhabits the interior of a compound 

 Ascidian, of a brown colour, incrusting the leg of a Maia squinado. 



M. Hesse also describes the male of his Botryllophilus viridis, 

 which is figured, together with the types of the above new genera, on 

 the plate accompanying his memoir. — Ann. Sci. Nat. 5^ scr. tome vi. 

 pp. 51-87. 



