156 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



Pecten (?var.) squarrosus Carpenter 1865 



(nomen dubium; extra-limital) 



Plate 10, fig. 1. 



Pecten squarrosus Carpenter, 1864, p. 536. [Nomen nudum.] Footnote: 

 "Of these forms, . . . the diagnoses are written, and will probably 

 be found in one of the scientific periodicals for 1864." [Additional 

 footnote saying species presumed to be from neighborhood of Santa 

 Barbara, California; ". . . first found by Col. J." (Jewett)] 



Pecten ( ?var.) squarrosus Carpenter, 1865, p. 179. [With description.] 



Pecten squarrosus Carpenter. Kobelt, 1888, p. 281. "Hab. Sta. Bar- 

 bara Californiae? — Valvae dextrae tantum repertae." 



Pecten squarosus [sic] Crptr. Paetel, 1890, p. 234. "Californ." 



Pecten squarrosus Cpr. Palmer, 1945, p. 99. 



"Pecten (?var. ) squarrosus" Carpenter. Palmer, 1958, p. 72, pi. 2, 

 figs. 1-3. 

 Syntypes: Redpath Museum, McGill University, Montreal, Quebec, 



Canada. 



Type locality: ? Syntypes (2) represent two species; locality of 



neither specimen verifiable. 



Original description: P. testa orbiculari, aequilaterali, rubida, albido 



maculata ; valva dextra convexa ; costis xviii., aequalibus, testa jun. 



approximatis, testa adulta interstitiis aequalibus ; costis et interstitiis 



regulariter undatis, striis crebris squamosis radiantibus ubique ornata; 



auriculis magnis, latissimis, subaequalibus ; antica anguste fissata, serrata, 



postica sinuata; auriculis ambabus et regione contigua scabrose striatis; 



intus alba, linea cardinali alte sulcata. Long. 1.82, lat. 1.79, alt. .9. 

 Hab. 'Sta. Barbara,' teste Jewett. 

 Resembles a shell in Mus. Cuming, marked "exasperatus, var.", 



but does not agree with the diagnosis of that species. All Col. Jewett's 



valves were dextral. The locality needs confirmation. 



Remarks: This is a perplexing species. Up to 1958 it had appeared 



in the literature only three times after Carpenter described it, Kobelt 



merely reprinting the original description, Paetel including the name in 



his catalogue (citing Kobelt), and Palmer referring to the types as 



being among those of Carpenter's in the Redpath Museum. 



In 1956 the author wrote to Dr. Vicente Conde, of the Redpath 



Museum, requesting a photograph of the syntypes. He kindly furnished 



it, along with the measurements of the valves and the information that 



I 



