192 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Amphiroa polymorpha Lemoine 

 Plate 54 



Lemoine 1929, p. 74, pi. 3, fig. 2. 



Costa Rica: infrequent in tide pools near the entrance, Golfo 

 Duke, no. 39-116B, 26 Mar. 1939. 



Amphiroa dimorpha Lemoine 

 Plate 55 



Lemoine 1929, p. 76, pi. 3, figs. 3, 4, pi. 4, fig. 6. 



Mexico : Nayarit, a small form probably this species, the medullary 

 sequence somewhat irregular, I. Isabel, no. 34-5880, 5 Mar. 1934. 

 Ecuador: Archipielago de Colon, dredged from 3.5-5.5 meters' depth 

 in the bay, I. Santa Fe, sta. 46, Schmitt no. 46C-33, 2 Feb. 1933. Ibid., 

 intertidal on the lower rocks, and in the deeper tide pools near Black 

 Beach Anchorage, L Santa Maria, nos. 34-236, 34-240B, 34-244B, 17 

 Jan. 1934. Ibid., intertidal on an islet in Gardner Bay, L Espanola, no. 

 34-429, 31 Jan. 1934. 



Amphiroa foliacea Lamouroux 

 Plate 56 



Weber-van Bosse 1904, p. 92, pi. 14, figs. 1-11. 



One familiar with the West Indian A. Tribulus (Ellis & Solander) 

 Lamouroux notes at once how similar it is to A. foliacea. Indeed, Mme. 

 Weber {ibid., p. 93) mentions having received A. foliacea from the West 

 Indies. However, the Caribbean plants the writer has found have been 

 larger, more sprawling and less consistently broadly winged. With so 

 few and such small individuals the name of the Pacific form is retained, 

 since the material agrees very well with the illustrations given by Mme. 

 Weber. 



Mexico: Nayarit, scarce as dredged from 24 meters' depth with 

 other Amphiroas on large rocks at sta. 970, no. 39-641, 9 May 1939. 



Amphiroa van Bosseae Lemoine 

 Lemoine 1929, p. 72, pi. 3, fig. 7. 

 Reported from I. Santa Maria, Archipielago de Colon. 



BOSSEA Manza, 1931A 

 Plants fragile, branching dichotomously or more or less alternately; 

 segments below compressed or cylindrical, but above always compressed ; 

 flexible joints of a single zone of cells ; calcified segments showing straight 

 medullary filaments consisting of several zones of cells of equal length ; 

 conceptacles hemispherical to conical, on the flattened surfaces of the seg- 

 ments. 



