. Bulletin. Science; Natural history; Natural history. Fig. 1. Left specimen: Rabdotus nigromontanus (Dall, 1897), WMB 7190. Middle and right spec- imens: Holotype oi Rabdotus christenseni, new species, CAS 037525, apertural and dorsal views. All figures Reproductive anatomy of holotype.—Diagnostic characters are in the penial complex. Penis mm in length, entirely contained within a thick penial sheath; epiphallus mm, the lumen of the apical mm lined by shallow longitudinal folds, then distally, for about mm, the folds assume a spiral arrangement; remaining distal mm
. Bulletin. Science; Natural history; Natural history. Fig. 1. Left specimen: Rabdotus nigromontanus (Dall, 1897), WMB 7190. Middle and right spec- imens: Holotype oi Rabdotus christenseni, new species, CAS 037525, apertural and dorsal views. All figures Reproductive anatomy of holotype.—Diagnostic characters are in the penial complex. Penis mm in length, entirely contained within a thick penial sheath; epiphallus mm, the lumen of the apical mm lined by shallow longitudinal folds, then distally, for about mm, the folds assume a spiral arrangement; remaining distal mm contain highly convoluted, glandular diverticula. Junc- tion of epiphallus and penis marked by a distinct constriction of the lumen. Epiphallic caecum mm; penial retractor muscle very short, mm long, attached to apex of epiphallic caecum. Vas deferens runs free from its origin at base of prostate gland, along free oviduct and vagina, and enters penial sheath at about mm from genital orifice; it continues apically within the penial sheath, but free of the penis, and resurfaces at the apical end of the sheath, after which it runs alongside the epiphallus until its insertion at junction of epiphallus and epiphallic caecum. Variations in paratypes. — A total of 4 adult, entire shells and 6 immature or damaged shells were collected in two separate visits. The largest adult paratype measures mm in height and mm in diameter, and the smallest measures mm and mm respectively. All specimens, adult and immature, show the characteristic sculpture and slenderness of the species. Disposition of types. —HolotypQ: CAS 037525. Paratypes: WBM 7216, personal collection of W. B. Miller, and RLR 543, personal collection of R. L. Reeder. Type locality. —Pima. Co., Arizona; north end of the Santa Rita Mountains, in large rockslide on left bank of south fork of Sycamore Creek, ca. 100 meters upstream from Sycamore Spring; Lat. 31°'N, Long. 110°'W; elevat
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Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
