48 Memoirs of the Indian Museum. [Vol.. Ill, 



The external anatomy will be fully dealt with by Dr. Annandale in a later 

 publication. 



The oesophagus is thick and muscular, the stomach rounded and filled with small 

 yellow globules. The anus is open and lies between the last pair of appendages. 

 The alimentary tract has all the appearance of being actively functional. 



Nervous system. — The nervous system consists of two closely approximated oval 

 cerebral ganglia, bearing the large eye at their junction, and of a large ventral 

 ganglion representing the ventral nerve cord. These two are connected by the usual 

 commissures. 



There is no cerebral ganglion close to the mouth as represented by Gruvel in the 

 case of Ihla quadrivalvts. In this place it is true there is a small cellular body which 

 might be mistaken for a ganglion, but it is in reality a small salivary gland, and is not 

 connected with the nervous system. 



The eye consists of an almost closed retinal vesicle of nerve cells. This vesicle 

 contains pigment granules arranged in symmetrical masses like the segments of an 

 orange inside the peel. At the pole of the eye nearest to the surface the retinal layer 

 is absent and the pigment comes to the surface of the eye. 



The reproductive system consists of two many-lobed testicles, two muscular vasa, 

 two seminal vesicles and a terminal ductus. There is no penis. 



The cement glands are two masses of cells lying below the testicle. They are 

 entirely free from the granules which occur in Scalpellum squamtdiferum, hengalense 

 and gruvelii. 



There are none of the yolk masses such as occur in Scalpellum, but the tissue 

 spaces of the peduncle are filled with minute fine granules, which are doubtless of the 

 same nature. 



B. ABSENCE OF RUDIMENTARY TESTES IN THE FEMAI.E 

 OF IBLA CUMINGIL 



The entire prosoma of a specimen was cut into serial sections and carefully exam- 

 ined for the rudiments of a testis, the developing testis of the hermaphrodite of 

 Scalpellum squamuhferum {vide sttpra) being examined for comparison. No vestige 

 of such an organ was found. 



Hoek (8, p. 19) made the same examination of the large form of Scalpellum 

 regium, H., and did not find any trace of a testis. 



VII. SENSORY HAIRS IN SCALPELLUM SQUAMULL- 



FEIiU3I. BENGALENSE AND GBUVELIL, 

 AND IN IBLA CUBIINGIL 



(PI. vi, figs. 9 and 10.) 



The entire surface of both capitulum and peduncle in the above three species of 

 Scalpellum is covered with minute hairs both in the dwarf and large forms. The 



