•IG Prof. M'Intosli's Notes from the 



project. A well-marked collar is present, Avitli a dorsal 

 tissure as in Cfione and an entire ventral margin. De St. Jo- 

 seph describes linear eyes on the fused buccal and first 

 segment, but these were not observable in the spirit- 

 speciuiens. 'Die number of the branchiie is from eight to 

 twelve on each side, and they show two chordoid cells in 

 transverse section. They have a double row of ciliateil 

 barbules, aud terminate in a naked process with a thickened 

 base. 



De St. Joseph observes that the foregoing fused segments 

 have, besides the eyes, two branchial heads, two red thoracic 

 organs debouching by a common canal at the base of the 

 brauchire dorsally, and two otocysts with trembling otolitiis. 

 Fauvcl"^, however, states that in the closed otocysts, to 

 which group those of Jasinineira belong, the "trembling" 

 is due to Brownian movement only, as there are no cilia. 



The body, Avhicli in spirit is about an inch in length, has 

 the outline of Clione, and is little tapered till the posterior 

 third. It ends in a slender tip, with a conical papilla above 

 the anus. The anterior region consists of nine segments, 

 the posterior of twenty-four or twenty-five segments, or even 

 more (De St. Joseph gives a total of forty). The ventral 

 groove cuts through the right edge of the eighth ventral 

 shield in its progress to the dorsum. The ventral shields 

 commence anteriorly by two small ones, and the next seven, 

 which are entire, rather increase from before backward. 

 The scutes of the posterior region are in pairs, being dis- 

 tinctly separated by the broad ventral groove. Diminishing 

 iu size, they become invisible on the minute terminal seg- 

 ments. The first bristle-tuft is small and occurs near the 

 posterior border of the united buccal and first segments. It 

 consists of simple but by no means feeble bristles, the shaft 

 a little diminished at the neck, so that the slightly curved 

 tip with its narrow wings and acute point is clearly differen- 

 tiated. Nine bristle-tufts occur anteriorly. The bristles of 

 the anterior region generally consist of two kinds, viz., 

 Avingcd capillary bristles with the slightly curved and acutely 

 tapered tips, and spatulatc forms the wings of which rapidly 

 dilate, terminate abruptly, aud have a short median process, 

 often bent. The bristles of the posterior region, which are 

 below the hooks, are of one kind only (viz., the simple, 

 winged, tapering form), but the tips have, even in the first 

 ])art of the region, a tendency to elongation, and toward the 

 end of the tail the tips of the bristles are extremely elon- 

 gated, so as to resemble fine hairs, though the narrow wings 



* Op. cit. 



