of Tercbratulina septeutrionalis. 415 



for it was bclievoil that tlie relations between them and the 

 I'olyzoa, as nrged by Aj^assiz, Mihie-Eilwards, lluxK-y, 

 Ilancoek, Dana, and others, wouUl be veritied when the deve- 

 loj)nient of the Bracliiopoda was known. In this path of 

 inquiry the investii^ator will fuid an open field. 



For a loui:: time 1 have l)een interested in the relations of 

 the elass under eonsideration, and in an early ])ai)er, entitled 

 *' llienial and Neural Ue*,fi<>ns of liraehiopotla "*, and later, 

 in a ])a|)er " on the Classitieation of Mollusca, based on the 

 Prineiplc of Cephalization " f, urged the intimate relations 

 existing between the Brachiopoda and Polyzoa. With the 

 hope of learning something about the early stages of one of 

 our native speeies of Braehiopods, I visited Eastport, Maine, 

 in the early ])art of June 1869; and this connnunication em- 

 braces a sunimary of the ineomplete observations there made 

 — incomplete, as I was unable to secm'e any data on the em- 

 brj'ology of the species. At the outset my microscojie proved 

 altogether inadequate to the work before me, though the mi- 

 nute size of the objects examined, coupled with the compli- 

 cated texture ot the shell through which the soft parts had to 

 be observed, rendered the work at the best laborious and ditfi- 

 cult. In every case, however, the figures given in -the accom- 

 panying plates are correct transcripts of the drawings made 

 from the animal : in no instance is there given any combina- 

 tion of several unfinished sketches to make a more intelligible 

 or perfect whole. This will explain the absence of detail and 

 completeness in many of the figures presented ; at the same 

 time it is believed that the outlines will be more valuable from 

 the fact that they are not schematic or composite. 



For a clear exposition of the organization of tlie Brachio- 

 poda, I would refer- to the exhaustive memoir of Albany 

 Hancock above referred to — a memoir which justly merited 

 the honour conferred upon him in the award of the Royal medal. 



On the Earhj Stages of Terebratulina septeutrionalis, (Jou- 

 tliouyX. — The specimens upon Avhich the folloAving examina- 

 tions Avere made were dredged in fifteen-fathoms water in 

 the harbour of Eastjiort, Maine, in the first week of June 

 1869. The species occurs in great numbers at various depths, 

 and has also been collected at low-tide mark, by Dr. Stimp- 



• Troc. Boston Soc. Nat. Hist. 1862, vol. ix. 



t Proc. Essex lustit. Salem, 18Go, vol. ix. part 6. Also reprinted in 

 Amer. Jom-n. Sc. & Arts, 1800, vol. xlii. no. 124. 



X A brief resume of this paper was published in the ' American Natu- 

 ralist,' 180U, Sept. No. vol. iii. Since reprinted in Amer. Joum. Sc. and 

 Arts for Jan. 1870. 



The general results Avere communicated at the 18th Annual Meeting 

 of the American Association for the Advancement of Science, Aug. 1809, 



