. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 110 Bulletin So. Calif. Academy Sciences / Vol. 66, No. 2, 1^67 The embryos have 109 to 117 primary annuli and 90 to 96 secondary annuH, the eye and tentacular groove roofed, though the eye is still slightly visible, and a reduced number of deciduous teeth. Colora- tion is similar to that of the smaller embryos. Gills are not present in any of the Los Diamantes Figure 1. Left side of head and gills of 52-mm. Gymnopis embryo. 12 x. Line â = 1 mm. External morphology of the gill: The h
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 110 Bulletin So. Calif. Academy Sciences / Vol. 66, No. 2, 1^67 The embryos have 109 to 117 primary annuli and 90 to 96 secondary annuH, the eye and tentacular groove roofed, though the eye is still slightly visible, and a reduced number of deciduous teeth. Colora- tion is similar to that of the smaller embryos. Gills are not present in any of the Los Diamantes Figure 1. Left side of head and gills of 52-mm. Gymnopis embryo. 12 x. Line â = 1 mm. External morphology of the gill: The head and left gill of the 52-mm. specimen are shown in Figure 1. The gills originate mm. from the anterior tip of the head and mm. from the posterior end of the mouth. Measurements ^vere made with a vernier caliper. The right gill has three fringed rami arising from a short stump attached to the head. The central ramus is nearly twice as long ( mm.) as the upper and lower ( mm. and mm., respectively). The central ramus arises from a stout base ( mm. wide and mm. long). This ramus has four filaments ( to mm. long) at regular in- tervals along its lower side, a terminal tuft of three filaments (all mm.) distally, and two filaments ( and mm.) on its upper side. The upper ramus bears four dorsal filaments (all mm.), a terminal tuft of four filaments ( to mm.) and two ventral filaments ( to mm.). The lower ramus has two dorsal fila- ments (both mm.); the terminal tuft is broadly united with short free filament ends (all mm.); the ramus has four ventral filaments (all mm.). The rami of the left gill measured mm., mm., and mm., uppermost listed first. The upper ramus has three dorsal filaments ( to mm.), an end tuft of three fila- ments ( to mm.), and two ventral filaments (all mm.). The central ramus has four dorsal filaments ( to mm.); the terminal group of filaments is som
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