. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A MODIFICATION OF THE URODELE TESTIS. 147 testis in Ambystoma, or the bluntly-rounded termination of the organ in other L rodele males lacking an appendage. To understand the origin and significance of the appendage it i- necessary to note its seasonal changes, both in gross appearamv and in histological detail. These will be first outlined as they occur in Plethodon glntinosus, a species in which the appendage ib prat tically a constant feature in the adult mak-. It is ni"-t <.«»ii-piriin- in animals killed from May
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A MODIFICATION OF THE URODELE TESTIS. 147 testis in Ambystoma, or the bluntly-rounded termination of the organ in other L rodele males lacking an appendage. To understand the origin and significance of the appendage it i- necessary to note its seasonal changes, both in gross appearamv and in histological detail. These will be first outlined as they occur in Plethodon glntinosus, a species in which the appendage ib prat tically a constant feature in the adult mak-. It is ni"-t <.«»ii-piriin- in animals killed from May to July. Siii'-e the body 1" MM testis i- tlit--ii approaching its maximum dianu-u-r. dm- to. I 34567 I i' ~. A scries of diagrams to illustrate : rma «>f th- common:- ,-d in L'rodeles. The cephalic end of the t -:pperm. IK. i. 1 I. cylindrical type of testis. tapering anteriorly, bluntly roun : ly. Found in the I'lethodons, Eur: inophilu<; during winter . in some males of these species, in surnn .ition of the lestis of Fig. i resulting iroin i-arlier emptying of the 'lal lobules. The anterior lobules still contain ;/- a, A :• tis of during the fall or early winter months in the 1M. tli'-loii-; oth. md is reduced to the type of Fig. i by the final emptying ot the lobuli :i of the testis of Fig. i resulting fpni . ,u » of the germ in ca;:dal lobules. Seen as a rule in spring months or in young male- m \\li : proportion of the lobules produi .th a caudal reduction ("caudal ulting from s in the caudal lobules of the organ. Found commonly in Pletlioiii": :mg the summer months; less common in l-'.urycea and ho dun chifrius. ;. ! ih a constriction resulting from localized germ-cell degenera- tion. 1 -'.. on] :lly, sometimes as an apparent preliminary condition to that illustrated in Fig. 4. 1 " Multiple testis" of Desmognathus resulting from delayed regeneration xual cycle.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
