28 PEOCEEDINGS OF THE NATIONAL. MUSEUM vol. 73 



Certain specimens from the former locality are quite solid and lack 

 spiral green lines, approaching so closely to grapMcus that it is 

 difficult to separate them. 



LIGUUS SOLIDUS DELICATUS Simpson 



Plate 1, fig. 4 



1920. Lignus soiidus delicatus Simpson, Proc. Biol. Soc. Washington, vol. 33, 

 p. 133. 



Shell usually rather thin and elongated, with somewhat flattened 

 whorls, straw colored to buff, sometimes having an occasional narrow 

 bluish axial smear or dark rest line; second to fourth whorls usually 

 with faint, longitudinal, brownish lines; there is a single, narrow 

 spiral dark line above the sutures and on the periphery, sometimes 

 very faintlj' white bordered. Axial region straw colored or pur- 

 plish. Rarely there are a few traces of spiral green lines on the 

 base of the shell. 



Length 65, diameter 28 mm, ; length 55, diameter 25 mm. 



Lower Matecumbe Key; Avest end of Upper Matecumbe Key; In- 

 dian Key (Wurdeman). I have several hundred specimens from 

 Lignumvitae Key, but none that I can refer with certainty to this 

 form. Rarely a specimen shows a few faint dots at the suture. 

 Usually distinct from the other forms, but an occasional intermediate 

 occur.s. 



LIGUUS SOLmUS SIMPSONI Pilsbry 



Plate 1, fig. 5 



1920. Liguus solidus lineatus Simpson, Proc. Biol. Soc. Washington, vol. 33, 

 p. 121. 



Shell large, usually elongated, thin but strong, with a pinkish axial 

 region; pale greenish straw color, entirely lacking bluish smears or 

 other variegation and without a dark peripheral band, usually with 

 a few green spiral lines or bands on the base. 



Length 60, diameter 28 mm. ; length 50, diameter 26 mm. 



Lignumvitae and Lower Matecumbe Keys. One shell received 

 from Dr. H. A. Pilsbry labeled " Grassy Key." I fir.st bestowed the 

 name Ihieafu-s on this form, but Doctor Pilsbry called my attention 

 to the fact that it had been used for a Ligit/ics by Valencennes and 

 suggested the name simpsoni for it. It has been very abundant on 

 Lignumvitae Key. where it is found mostly on the northern part of 

 the island. Certain shells of this form superficially rather closely 

 resemble some of the specimens of subcrenatus but may always be 

 distinguished on account of having a rosy apex, while that of the 

 latter is miikv white. 



