. Bulletin. Science; Natural history; Natural history. ISO Bl III ll\ SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 72. Figure I. Helminthoglypta ficldi Pilsbry, penial complex: ec, epiphallic caecum; ep, epiphallus; pe, penis; pr, penial retractor muscle; vd, vas deferens. Transverse sections slightly enlarged from main drawing. raised, roughly rhomboidal surfaces thus defined being more or less produced into papillae. In H. traskii the degree of papulation is variable from race to race; H. t. phlyctaena, for example, the nearest geographic neighbor of H. fieldi in the group, is conspicuousl
. Bulletin. Science; Natural history; Natural history. ISO Bl III ll\ SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 72. Figure I. Helminthoglypta ficldi Pilsbry, penial complex: ec, epiphallic caecum; ep, epiphallus; pe, penis; pr, penial retractor muscle; vd, vas deferens. Transverse sections slightly enlarged from main drawing. raised, roughly rhomboidal surfaces thus defined being more or less produced into papillae. In H. traskii the degree of papulation is variable from race to race; H. t. phlyctaena, for example, the nearest geographic neighbor of H. fieldi in the group, is conspicuously papillose on the spire, the papillae being reduced or absent on the last and penultimate whorls. Helminthoglypta walkeriana bears moderate to strong papulation, frequently eroded from the early whorls but dis- tributed generally over the body whorl and into the umbilicus. Helminthoglypta fieldi tends to develop groups of papillae only immediately be- hind the outer lip of some adult individuals. Scattered papillae, sometimes in linear groups paralleling growth lines, are rare on other parts of the shell, and many specimens have none at all. Occasional papillae occur in the umbilicus. The protoconch of H. fieldi (described from juveniles hatched to captive topotypic specimens, A. G. Smith collection No. 7954) is minutely granular in texture and more or less evidently. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
