[43] 



ENTOZOA OF MARINE FISHES OF NEW ENGLAND. 



495 



recognized, which was probably the spiculum. This enlargement of 

 the genital apparatus opened into a larger oval cavity in the extreme 

 posterior end of the body. This was evidently the male bursa, but 

 was still closed by the investing body-membrane. 



In some specimens which had been stained and mounted in glycerine, 

 bodies which looked like the lemnisci were discovered. These were 

 paired organs, very long and slender, tapering gradually to near the 

 posterior end, which was bluntly rounded. Their attachment was at 

 the base of the proboscis sheath. In one specimen the attachment 

 was by a short ligament. The general appearance of these organs was 

 much like that of the lemnisci of E. agills, but their attachment at the 

 base of the sheath, instead of near the base of the proboscis, makes their 

 indentification as lemnisci doubtful. 



In a series of thin longitudinal sections made from one of these worms 

 a cluster of spherical, granular masses was found lying just back of the 

 base of the proboscis sheath and apparently supported by the suspen- 

 sory ligament. These masses were each about 0.025 mm in diameter, 

 and each contained a number of smaller cells. It is probable that these 

 represent the early stages of the ovarian masses peculiar to this order. 



The proboscis sheath is thick-walled and made up of two layers, the 

 outer dense, about 0.03' nm thick; the inner loose in texture and 0.032 mm 

 thick. From the base to about the middle of the sheath these layers 

 are close together; from that point to the base of the proboscis they 

 separate slightly, but unite again at the base of the proboscis. A re- 

 tractile ligament extends from the proboscis back through the neck, 

 where it divides into two branches, which continue to the base of the 

 sheath, where they are attached. The sheath, extends to the third or 

 fourth row of ventral spines. 



An oblong granular mass was noted about the middle of the probos- 

 cis, seen in a thin section, and on its inner wall. A round granular 

 mass about 0.07 mm in diameter was seen near the base of the neck in 

 one section. I could find no indication of a ganglion in the base of the 

 proboscis sheath. 



Measurements of mounted sjiecimens. 



Nos. 1 and 2 were from Cynoscion regale, No. 3 from Pomatonms salta- 

 trix, and No. 4 from Paralichtkys dentatus. 



