8 Transactions of the Society. 



Callidina multispinosa Thorap. (##). 

 Synonym: Macrotrachela multispinosa. 



Several distinct varieties occurred. They are briefly described 

 here, but not figured, as there is in preparation a study of all the 

 forms of this and the related species, in which all the important 

 varieties will be figured. 



Variety brevispinosa Murray (19). — This form was first de- 

 scribed from Tropical Africa, where it occurred in Old Calabar, 

 Uganda, and Madagascar. 



The short-spined forms, with very few exceptions, have the 

 dental formula 2/2, an important distinction from the long-spined 

 forms, which have from three to five teeth in each jaw. 



Forma. — Several of the lateral spines on the anterior trunk re- 

 placed by ligular processes, with bulbose bases ; dorsal transverse 

 row of spicules on widest part of central trunk lacking ; spurs 

 slender, widely separated ; dental formula 2/2. 



This appears to be a stable variety, possibly a distinct species. 

 There is an almost identical form in South Africa. 



Variety. — One longish lateral spine on the anterior edge of the 



3 i 2 

 trunk — all other spines as in brevispinosa ; dental formula — 



or 5/5 ; spurs short cones, separated by wide interspace. 



Though looking like brevispinosa this may have been derived 

 from multispinosa by a reduction of the processes. The spurs are, 

 however, very different from British examples of multispinosa, and 

 it may be a distinct species. 



EXPLANATION OF PLATE II. 



Fig. 6a. — Habrotrocha ampulla sp. n. Animal and egg in case. 

 ,, 66. — Ditto. Head, more highly magnified. 

 ,, 6c. — Ditto. Lateral view of head. 

 „ 6d. — Jaw. 



,, la. — H. acomis sp. n. Feeding. 

 ,, 7/>. — Ditto. Head and neck, extended. 

 ,, 7c. — Ditto. Jaw. 

 ,, Id. — Ditto. Rump and foot. 



„ le.— Ditto. Ventral view of head, showing lateral Haps. 

 ,, 8a. — H. auriculata sp. n. 

 „ 86. — Ditto. Jaw. 

 ,, 9. — Callidina sp. 



,, 10a. — Mniobia scabrosa sp n. Creeping. 



„ 106.— Ditto. Jaw. 



,, 11a. — Callidina punctata sp. n. Feeding. 



,, 116. — Ditto. Jaw. 



., lie, lid. — Ditto. Two varieties of spurs. 



