134 THE BOTIFERA. 



intestine is frequently constricted and narrow towards its end. The gastric glands are two 

 lobed. He further notices the lateral canals, and a bladder-like organ which he conjec- 

 tures to be the testicle, but which was probably the contractile vesicle. Two red globular 

 eyes are seated in the corona, not far asunder. The mature eggs, which are green, are 

 carried at the posterior end of the body. There are three pairs of limbs attached to the 

 ventral surface,. The foremost pair is the longest, the middle pair is less, and the lowest 

 pair is the least. Two streaked muscles run down the first pair of limbs, and one muscle 

 down each of the other four. All the limbs are terminated by fans of setae. II. poly- 

 ptera does not appear to have any ciliated processes on the dorsal hind surface. 



ADDENDA. 



[AsPLANCHNA MYRMELEO, Elirenlerg (vol. i. p. 123 : footnote). This interesting 

 species is no longer an alien. Mr. Hood has lately sent me, from Dundee, living and 

 healthy examples. They seemed to possess no contractile vesicle. P.H.G.] 



[ERETMIA TKITHKIX, Gosse, sp. nov. (PI. XXVIII. fig. 2). Lorica a three-sided box, 

 of which the posterior end is a triangle, and carries a long elastic seta at each angle : 

 egg, when laid, carried between the alvine seta?. Length, , \ ._, inch. Lacustrine. P.H.G.] 



[ERETMIA TETRATHRIX, Hood, sp. nov. (PI. XXVIII. fig. 1). Lorica shaped like a 

 deep obconic wine-glass, of which the foot is represented by a very long straight seta : 

 three similar setae stand up from the occipital margin. Length, of lorica, T ^ 7 inch ; total 

 ? J-^ inch. Lacustrine. P.H.G.] 



NOTOMMATA WEKNECKii, Ehrenbcrg. I am indebted to Mr. Fred. Bates for some 

 threads of Vauclieria sessilis bearing many of the galls caused by this parasitical Rotiferon. 

 Mr. Bates says that he has found the animal in abundance inhabiting these galls, which 

 may occur anywhere along the thread of the Vaucheria : but that he has not found the 

 parasites in the reproductive cells (see vol. i. p. 89). 



Length (according to Balbiani), T -J^ inch. Habitat. Neighbourhood of Leicester 

 (Mr. F. Bates). 



(ECISTES PTYGURA, Ehrcnberg (PI. XXX. fig. 3). This is no doubt Ehrenberg's 

 Ptygura meliccrta. It has a two-lobed corona ; a wide dorsal gap ; no visible ventral 

 antennae ; a pair of large dorsal hooks, adnate for half their length ; a stout wrinkled 

 foot; and an irregular floccose tube. It was found last May, at Twickenham, by Mr. 

 G. Western, who kindly sent me the living specimen, from which fig. 3 has been drawn. 

 Its position, in one of the axils of the plant to which it was attached, prevented me from 

 measuring it ; but it seemed to be about the size of an ordinary Q^cistes crystallinus. 



The following remarkable Rotifera are as yet unknown in Britain. 



BALATRO CALVUS (PI. XXX. fig. 6), Ed. Claparcde (15). This is an il-loricated 

 Rotiferon, parasitic on different species of Oliyocliceta. Its peculiar hind extremity is 

 shown in the figure. Mastax very small, containing two minute curved rami ; stomach, 

 simple and straight ; ovary large ; ciliary wreath and antenna wanting ; nervous, and 

 vascular systems apparently absent. 



PRILOPHAGA BUCEPHALUS (PL XXX. fig. 5), F. Vejdovsky (150). An il-loricated 

 Proa/cs-like Rotiferon, parasitic on Lumbriculus varicyaiits ; it adheres by its trophi to 

 the worm's hinder segments, and sucks its juices ; nutritive, secreting, and vascular 

 systems normal. 



SEISON GiiuBEi (PL XXX. fig. 4), C. Clans (17, 18). A doubtful Rotiferon ; il-lori- 

 cated, of extraordinary form, parasitic on Nebalia ; ciliary wreath a few cilia at the 

 mouth ; secreting system highly developed ; nutritive system present in the male as 

 well as in the female ; vascular system very rudimentary ; jaws rotiferous. 



