certain Agnathoiis Pulmoitate MoUnsks, 67 



Tryoii *, relate to tin; slioll of the animal only, no description 

 liavin<^ yet been ^^Ivcmi of the aiiiinal, A H^^ure of the ratlula 

 lias been |)ul>lishe(l f, JU'd Siiter % has given a figure of the 

 animal with the .shell attache I, but tiie drawing leaves much 

 to be desired. 



Anatoviy. 



The Ah'metitan/ Canal. — The buccal maas is large, 

 measuring I8"0 niillim. in length in the alcoholic S[)ecimMi3 

 examined. The niu.scular attachments, as in the allied genus 

 Pari//>/um(a, arc very strong. The buccal retractors are 

 inserted posteriorly and ventro-laterally, laterally there are a 

 series of muscles which have their origin on the floor of the 

 body-cavity (IM. 1. fig. 10, r.m.). Posteriorly the buccal 

 mass has the appearance of having a muscular cap (PI. I. 

 figs. 10, 11), but on dissection this is fouiul to be due to the 

 upward curving of the terminal portions of the muscular 

 sheath of the radula. The radula is curved downwards in 

 the extreme anterior region and laterally embraces the mus- 

 cular sheath ; looked at from the opening of the mouth it 

 has the aj)pearance shown in figure 7 (Pi. I.). 



The a'S(jj/i<njuscn\L'YS the dorsal surface of the buccal cavity 

 about 4*5 millim. from tlie anterior end; it is a thin narrow 

 tube, eidarging to a wider cavity behind the salivary glands §. 

 1 hese latter are two large glands situated on the posterior 

 portion of the buccal mass (PI. I. fig. 10, s.rjl.) ; they are 

 fused together in the median line. From the anterior end of 

 each a long fine salivary duct is given off, and these enter the 

 buccal cavity slightly below and behind the opening of the 

 oesophagus (PI. 1. fig. 10). 



'J/ie Pedal Gland (PI. I. figs. 12, 13).— Lying on the 

 floor of the body-cavity is a small flatteTied structure — the 

 pedal gland. The actual gland measured 13 millim. in length ; 

 at its posterior end it makes a bend to the right side and then 

 again towards the left, thus being formed by what may be 

 described as three limbs; the third limb is jjartly covered by 

 a series of strands of pedal muscles. The retractor muscle is 

 attached ventrally and arises from the floor on the right side. 

 Attached to the underside of the third limb and lying dee|)ly 



• Man. Concli. 188.'3 (ser. 2) vol. i. p. li>6, pi. x.viv. (ig. 74. 



t Inins. N. Zt-al. Inst. vol. xvi. p. lt)7, pi. .x. tig. i'. 



\ Journ. of .Maine. 18!»9, vol. vii. pi. iii. fig. 1. 



§ Owing to part of the animal having he>m left in the shell, vrhich I 

 did not receive, I have been unable to describe the riMnainder of the 

 digestive svstem. 



5* 



