30 U.S. NATIONAL MUSEUM BULLETIN 23 9 



this paper. All of the species figured by Yen (1944) have been re- 

 figured, many from new photographs. 



If the type lot contained only one specimen and if the measurements 

 approximated those given in the original description, that example 

 has been regarded as the holotype. When there were several syn types 

 and it was not clear which one was the measured specimen, a lectotype 

 was chosen. In all cases, the actual measurements of the figured type 

 are given on the plate captions. 



Gould: Later Years 



Republication of the " invertebrata of Massachusetts." — 

 The description of the mollusks of the North Pacific Exploring Expe- 

 dition was Dr. Gould's last important work on new material. During 

 his latter years, he was engaged in revising his "Invertebrata of Massa- 

 chusetts" at the request of the state legislature, which had appro- 

 priated $4,000 for the task. At the time of Dr. Gould's death in 1866, 

 the work remained incomplete. Happily, William G. Binney, the son 

 of Amos Binney, was appointed to finish the task. Since Gould had 

 completed the work of Binney's father on the terrestrial mollusks of 

 the United States, it was fitting that these two names should again 

 be joined in authorship. 



Twelve hundred copies of the new edition of the "Invertebrata of 

 Massachusetts" were published, one for each member of the legislature 

 and one for each public library in the state. Fifty remaining copies 

 were distributed through the trustees of the State Library. 



Death of gould. — As previously mentioned, Gould was first of all 

 a physician. He was active in the medical societies of Boston and 

 Massachusetts and he served as an officer of more than one of these 

 groups. For several years he was a consulting physician at the 

 Massachusetts General Hospital. According to his daughter's ac- 

 count, Gould encouraged and advised Dr. W. T. G. Morton, the re- 

 puted discoverer of ether, suggesting for the first apparatus the use of 

 a valve that helped to produce complete insensibility. Gould was in 

 attendance when Dr. John Collins Warren performed the first opera- 

 tion with the new anesthetic. 



It is reported from old accounts that Gould was genial and drew 

 friends around him, retaining the old and attracting the new. He 

 did not possess the emotions of an enthusiast but rather was of a 

 calm, contemplative nature, with clear preception and awareness of 

 his surroundings. He was a religious man and for more than 30 years 

 a constant member of the Baptist church, practicing religion rather 

 than talking about it. According to W. H. Dall, Dr. Gould "was tall 



