44 BULLETIN OF THE 



enlarged : A, dorsal adjusters ; B, frilled portion of oviducts, seen as if 

 through the transparent tissues ; C, anterior tubular portion of oviducts, 

 terminating externally in (E) the oblique genital foramen ; D, D', upper 

 and lower portions of the nasiform body ; F, intercorporeal groove ; II, 

 supra-cesophageal body ; I, space between the last and the brachia ; J, 

 stumps of brachia, cut off to expose the other parts; K, oral groove 

 between the superior and inferior labia ; L, mouth, with the median prom- 

 inence of the superior labium above it ; M, median notch or sulcus of the 

 inferior labium (N). 



1G. Attachments of the free end of the frilled portion of the oviduct, 

 much enlarged : A, free end of right oviduct ; B, attachment of the same 

 to the mesentery (E) ; C, apparent foramen ; D, secondary attachment, 

 which appears to be of a tendinous consistency and carries a bloodvessel 

 which enters the oviduct, to all appearance. 



Plate II. 



Fig. 1. Diagram of the soft parts of Waldheimia floridana, much -en- 

 larged. In this figure the pedicel, the peduncular muscles, and all the 

 other muscles except the occlusors, have been removed. The posterior 

 parts of the mantle lobes are not represented, as they would cover the parts 

 which it is desired to exhibit. The neural lobe is above and the haemal 

 lobe below. The pallial sinuses are represented with much more promi- 

 nence than they actually exhibit. They are really almost invisible and are 

 exceedingly difficult to trace even under a high power, so that their out- 

 lines as here given must be regarded as provisional, though they are prob- 

 ably sufficiently accurate. The parts are represented as they appear (with 

 the calcareous matter removed by acid), floating in water, with the pedun- 

 cular end towards the observer. The small genitalia are suspended in the 

 posterior part of the sinuses. The posterior end of the stomach, with the 

 heart and hepatic lobules, appear between the occlusors. Below them is 

 the fold in which the septum of the hamial valve extends half-way to the 

 margin between the median sinuses. The oviducts are seen in their 

 proper position. The broad brachial disk, with its appendages so widely 

 separated, is seen through the transparent membranes. The pallial lobes 

 are fringed by the very short close-set seta?, inside of which runs the 

 slender circumpallial muscle. 



2. Represents the stomach with its appendages from behind. The 

 hepatic digitations, obscurely divided into lobes, cover the lower portion of 

 the stomach, and above them is seen the heart at the junction of the intes- 

 tine and stomach. On each side are seen the edges of the oral groove or 

 labia in front. 



3. Side view of the same, with the hepatic lobules removed to show the 



